Ok,
Just played with the app a bit. Here are some intitial thoughts..
1. A start/stop/pause button on the main screen would be good, This would allow for the pre-scheduled breaks (more serious game) or the ability to simply take a break when the table decides to (less serious game)
... speaking of which, can you just run the pre-set breaks down to 0 and it's as if you don't have any scheduled?
2. The app needs to stop at the expiration of a round due to being in the middle of a hand, then started back up for the beginning of the next round and the increased blinds (also a reason for #1)
3. A tab or options page with preset blind structures and/or configurable blind structures
4. Oh yeah, an actual end of round timer sound to go off just before it pauses and waits for your prompt to begin next round/upped blinds ... in a game where guys are a little more serious they will run right past the time if something doesn't sound off to get their attention.
5. the afor mentioned stuff about number of players in the tourney, buy in and payout structure, and the power and config stuff you mentioned would be nice too, but the above stuff is needed to make it usuable to run a small home tournement.
Hope that feedback helps!