Talking with upstream, the timeout for that use to be 10 seconds and should be 60 seconds now (Was bumped up around the beginning of the year). Since...
That sounds feasible. The only thing I might suggest is that if you have a supported remote (I use a windows MCE remote), to use the built in kernel...
Are you using an up to date version of mythtv? ( I see you are on 0.25, but the Mythbuntu developers have a 0.25+fixes repo that you can activate in...
*Don't forget to mark the thread as solved
*Don't PM me directly for support, open a new thread
*If you don't have recent first hand experience with 64-bit, please don't comment on it's current status