I decided to test this because oRA2 modules really lack in customizing (or don't even have the , so I was glad to see I could adjust RCD to my likings :)
There's a couple of minor toggleable options I'd like to suggest:
1) Option to automatically clear cooldowns when I leave the raid group
2) Perhaps option to hide the countdown bar (color) so you only saw the icon+text, like "[Icon] [Name] [Time]"
I also noticed that I can adjust the width of the bars when there are cooldowns but adjusting the height doesn't work as well on the fly. Minor stuff :) (edit: this apparently is on the ToDo-list :P)
edit2: I set the colors and bar textures ("Empty") so that the countdown bar is only visible because of the cooldown spark, how would I remove that?