I really love colour-coding my postits during sessions, and one frustration is having to move the mouse so much in the moment when I want to switch colours.
My workflow for creating new post-its is to press “N” and then go and choose the colour, then move the mouse back to where I’m in the workspace and place down the postit.
A better workflow would be to press N and have a radial menu open up AT THE MOUSE CURSOR with all the colour options right there at hand.
Another usable option is to make the N hotkey actually place the note down at the current cursor location. Then you get the style popup right there in-context and can change colours.