Definitely should be a docker, in my proposal of Quick Access Toolbar
You will see that in my mockup, a Brushtip quick access tab is present.
What I mean is - I also want to have a quick way to make them, store them and switch to them as I draw.
I think the brushtip docker should be able to do the following;
- Ability to quickly create your own simple shape brushes [ this are the round and square ones ]
– give access to quick edits. - Ability to add and edit image to be used as brush tip
– give access to relevant options on the fly.
– How many times do you want to change the lightness and intensity of the tip while working? - Quickly change brush tip. [Ordinary to Image to Image brush tip]
- Quick creation of new tips [Sampled, Import, Animated, From Image, etc…]
Like i think this would give more power to RGBA brushes.
sample an area - with current tip , sample get added to brush tip list as RGB. Quickly edit RGBA settings 
