This posting is older than 6 months and can contain outdated information.
Sorry, just figured I forgot to put a few words in. Here's the more 
understandable version: ;-)
That'd take
- writing an application that runs on your phone
- writing an application that runs on your Mac that 
+ takes care of pairing with your phone 
+ is responsible for the communication with the phone 
+ forwards button events to Remote Buddy (there's a basic, public 
AppleScript API and a direct, but non-public API, for which ready-to- 
go source code is available strictly on an individual basis).
Best regards, 
Felix Schwarz