I'm fairly certain you have to use the Live API to do this and I've just gotten lost in the API documentation trying to find how it's done since reading your post. Hopefully someone more hip to the API can chime in.
hi. by your patch post above it seems you just want time sig? anyway, here is a copy/paste from a portion of a timer patch i was writing when the beta first came out - it might be interesting, you'll have to ignore some of the patching / comments. basically, you should look at the Max "Extras" menu and the "M4L.api.ListOfAbstractions" item - plenty patches there to get you going. the cycling guys warned of not trying to run a constant timing call through the api (ie, setting a running timer through 'set current_song_time' is a bad idea apparently).