Ah that could work yes. Only problem is the mass of posts saying: "/tip $.0001" everywhere.
A solution would be to have a little tip user button below all users' avatars. Click on it and a like box opens where you just clicked, type a tip amount (minimum $0.5 maybe?) hit enter and bingo, tip sent!
Changetip already has a little button that can be used:

I would think it would be easy enough to set up, but you may need to have an account with changetip to get the code, and I don't know how it would fit into this forum's rules, since I could see it going in the signature spot normally... but I don't know how it would work with the forum rules of signatures right now.