Thanks for the words of praise and the suggestions - it's always good to hear from new people finding and using the program.
The automatic loading of the right map function has been on the wishlist for a long while, it's related to the idea of breaking the map images into tiles so that large maps can be loaded on demand - unfortunately I just never seem to have the time to get around to it.
Somebody volunteered to look at adding some of this to the code (which is all freely available from the website should anybody want a crack at it) a while back, and reported some initial success, but since then I haven't heard from him
The power-off thing seems to depend upon the type of device you have: mine, an iPAQ 2210, appears to stay on for as long as my bluetooth GPS receiver is connected. Depending on your device you can normally disable the auto-power off function, but ideally I suppose that should be an option of GPSMap so you don't run out your batteries - eg. a "disable auto power-off when GPS is connected" setting. I'll add it to the TODO list for looking at!
dr. matt.