Thanks for making the thread. KA is a good place to get more artist feedback. 
Just gonna chime in and share some thoughts:
@bourumir :
Educational animations
One of the areas where I image this could be useful are educational animations showing say chemical formulas being converted in reaction, or matrix multiplication, or some mechanism working. They do not necessarily benefit smooth movement as much as usual movies and need effort to understand, so should be rendered slowly.
Easy/simple animations
I have seen some Krita beginners spending so much time effort on each frame that the usual 24 FPS looks way too demanding. Probably some would like to render at very slow rate of 1/2 or 2/3 frame per second just to see that it may be an animation, that it may work for them.
Also, I am not sure if some advertisement clip may not be rendered slowly if 24 FPS is too expensive to produce.
I agree that there are times where smooth animation isnât wanted or needed. What I donât understand is why the desired result canât be achieved by simply holding frames by spacing them out on the timeline. (In other words, placing a frame at time 0, then the next frame at time 6, etc.)
And as @EyeOdin points out, we also currently have another option of rendering each frame out as an image to be used in a video editing program or slideshow presentation.
Storyboards
Some movies like âSpirited awayâ, for instance, have a story board published as an additional material. It represents a series of pictures that are very far away, differ from each other significantly and if to render them at all for general impression, then likely at the speed of frame per few seconds only.
Weâve recently added a Storyboard Docker and Storyboarding workspace that, though still pretty new, do a pretty good job of handling this use case. Timing between scenes is handled in seconds + frames format, and changes are synced to the animation timeline docker.
@AhabGreybeard :
I always try to work on the principle of âJust because I canât think of a use for it that doesnât mean that someone else wonât think of a use for it and do good things with it.â
Yeah. This is a good principle. But I also have a responsibility to make sure that the things we add to Krita are in service of animation and storyboarding workflows. As such, the real workflow benefits of adding a feature always have to outweigh the costs of complexity with regard to UX and code.
Iâm a pretty average artist and animator myself, but as youâve pointed out, even if I was better there are going to be times where Iâm not able to see the benefit of a proposed feature, which is why itâs good to have conversations like this where the community can make a case for why (and how) something should be added.
As one of the current âmaintainersâ of Kritaâs animation and storyboarding stuff, I will try to keep an open mind about things. So please hold me to that. 
Is this only suitable for animated .gif output?
In the past, Iâve noticed that .mp4 output does not behave well with low frame rates but I donât know if that is a problem with ffmpeg or the video player I use.
Because weâre talking about the global timeline âframerateâ setting here, it would be expected to work across all of our export formats.
The expression of frame rate in fractions seems clumsy and not related to userâs practical requirements.
e.g. Iâd actually want a frame every 4 seconds and would like to enter that as the time interval between frames, probably as â4.00â.
Would that be possible?
As of right now, Krita animations are timed in terms of integer âframes per secondâ, which is the most common and intuitive way of expressing frame rate. So â4.00â would be understood to mean â4 frames per secondâ, while â0.25â or â1/4â would mean â1 frame every 4 secondsââŚ
Whether any of that is intuitive or good UX is a big part of the question that I have right now, especially when you can just set the framerate to 1 frame per second and space each keyframe 4 frames apart.
How much it is really needed for a krita work flow? I have no clue. I did 2 or 3 animations in Krita and my issues were with looping things more than frame rates. I did 5fps which is pretty slow already.
More than 1 second per frame seems like a slideshow or like an animatic type of deal? But animatics already have timming they are not fully X frames per image.
I never did such slow animation so I donno. Maybe someone else knows this case better?
This is more or less my feeling on the topic. Iâm not against fractional framerates as long as everything works and is relatively clean. Iâve highlighted some changes in the MR to do just that, and support for other formats is something that we can test and hopefully address if needed. But Iâm also interested in seeing how useful this feature might be to other Krita animators.
