1. why does the save dialog pop op every time i save my file? 2. is toggle full-screen-mode command shortcut (ctrl-m) available for customization? 3. saved, preset brush size menu? 3, 8, 20...
When you save a brush variant it will remember what you had the brush size set to- then you can set up a custom palette for your saved brush variants at whatever different sizes you saved them at.. Hope this is what you needed.
Hi (1) If you go into File > Preferences > Save then the TIFF and PSD options may be set to Prompt on Save. I always use RGB colourspace for both. (2) No, I don't think it is. (3) Afraid I have no clue on this one.