As far as I know it was officialy confirmed on ArcheAge twitch.tv, that using mouse extra buttons to bind them with keyboard is allowed.
I play on ArcheAge RU, which has the same anti-cheat software as the ArcheAge EU which is Hackshield.
Hackshield somehow, i dont know why, crashes my game and opens Hackshield troubleshooting after like 30-40sec of using buttons on my mouse. Those are not macros just button1=keyboard 1.
I tried it on Logitech G9, and Bloody V7 in both the same situation. There is no mouse software installed on my PC, all the bindings are in mouse's memory.
I also made a Windows reinstall to make sure my PC is free of illegal software
If some1 has any ideas or similar problem please reply.
PS. I cannot imagine playing MMO without using my mouse extra buttons.