I would like to see support for multiple units

Right, like Skibum said, just make two different folders and then you'll have two different programs with independent configurations.

I was planning to have a go at this type of app for the PPC as soon as I get my iPAQ

I don't have any plans to port it to any other environment, let alone pocketPC, so you should probably have a look at doing it yourself when you get the iPaq in.

my guess is that it shouldn't take a lot of converting

You'd be surprised. It's quite likely that you'd spend less time writing it from scratch than I would trying to shoehorn my convoluted design into PPC.