You can have dockers visible in canvas only mode but you need to set it up right. Have a look at the three posts I made in the toolkit plugin thread from this point onwards: https://krita-artists.org/t/toolkit-1-0-1/9273/53
That should explain everything you need to do. The reference docker works (I just tried it), but I don’t have the timex one so I’m not sure about that. If it’s a docker it should work in theory.
To enable the code for the eraser toggle button; the config file needs a line in the canvas section corresponding to the label in the button code, and with a value of 1 to enable it i.e. eraserMode=1