@electroaudio,

Unfortunately I (still) don't know so much about Maemo, but if your idea would work it would be quite great.

No need to tweak the calendar, just use as normal and set alarms for the events you like. Then your event-sniffer kicks in and decides if your event gets a special treatment or passes it to the standard alarm handler.

Gee, if I had the time I would even do it myself!