I got around to testing the "show collisions" feature and it's neat... Except I can't actually see it! (Unless I put the plugin fullscreen and really turn up the brightness).
I - like about 9% of males (that means almost 9% of your userbase in practise) - am red-green colorblind and have serious difficulty seeing dark or unsaturated shades of red. It'd be great if there was an option to make the conflicts brighter and more obvious.