I think "trick play" refers to being able to pause, rewind, and fast forward either live or recorded programming. Someone correct me if that's not what he's referring to.
I don't really mess around with manual timers, but some people like them to record a block of primetime programming so that you don't miss those 30 seconds of time that it takes for the reciever to stop a recording and innitiate another when you are recording a show back-to-back. This is a problem especially when networks offset their programming so then do not begin or end "on the hour".
iPad update should be coming "soon" as a lot of people here like to say. We got an update to the iPhone remote access app last week. Hopefully the iPad update should be any day now. For now, you can use that beautiful UI to control your TV1 output, set timers, and do searches. Panning through the huge program guide by touch is a really nice experience.
I'm not really sure what you're trying to ask there at the end. My "Only New" timers from last season have been working just fine even when some shows have changed time slots this season. Are you sure your timers aren't set to record all episodes instead of only new ones? Or maybe you need to look and see what your default record settings are?