1) Tell Remote Buddy which Behaviour it should activate and mark sticky.

F.ex. for EyeTV, this'd be:

tell application "Remote Buddy" 
behaviourcore accessor "setActiveBehaviour" identifier 
"com.elgato.eyetv" with stickyValue 
end tell

2) Tell Remote Buddy to mark the currently active Behaviour sticky:

tell application "Remote Buddy" 
behaviourcore accessor "setSticky" with stickyValue 
end tell

(yeah, AppleScript has an interesting syntax ;-)

Remote Buddy's AppleScript dictionary has more info on the available 
commands.

Best regards, 
Felix