Well, this is just off the top of my head:

1) Ability to save/load multiple configurations. Sometimes I'd like to backup my current config before a radical change.

2) Ability to load your own small icons. Or at least, improve the icon database to include more than 20.

3) Ability to re-order buttons on device pages.

4) Multi-page tasks, as opposed to simply linking to another task page. (Should be easy since multi-page devices already exist.)

5) Different colored buttons. I'm not expecting new shapes and sizes, but I'd like to be able to have white, light gray, medium gray, dark gray, black (with white text of course).
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