I would like tricks to be a two charge ability and not on the GCD. It would also be nice if it was a 40 or 60 second cooldown instead of 30, and had a bigger effect than 15% for 6 seconds. This would really reward watching your allies and buffing them versus stomping it mostly on cooldown.
If you don't like this... well, sorry. I get that not every rogue likes it. I don't really get why they don't though- I think it's amazing fun to line up tricks on the burst cycles of my friends. They make macros that say some of their bigger cooldowns, and I would love to be able to float an off GCD tricks that had charges for this reason.