copernicus, i think the ideea with repeated IR signal is a nice one. as i know, for samsung at least, does not matter if the signal is repeated, because the tv response is preety slow.
also, due to some hardware issues of the n900 ( meaning the positioning of infrared port, the angle of signal distribution ) it's not working wery well as a remote, making necessary pressing many times for a command.
what i think that u could do, is to make an option in settings for repeating signal, maybe some options there regarding the repetition rate. or to integrate this according to different tv marks.

why i say that? because i own a phillips and a samsung, and their answer on remote is different. samsung is taking each command and make-it ( changing the channel one by one is a small disaster, untill does not show the next channel he don't take next command from remote ), phillips is changing as many channels as u want, depending on how many press u have.
i hope u undestand what i wanted to say.

good luck, ans congratulation for program. it have a lot of potential.