If you're feeling adventurous....
ActivePhone's appearance is dictated by an HTML file in C:\Program Files\Common Files\X10\Common\WebApps (or Program Files (x86) if you're on a 64-bit computer).
The file is known as PalmPad.html, and as long as you make an extra copy for yourself (in case something goes wrong), you should be able to modify it to your heart's content.
If you didn't want to learn the nitty gritty of how their particular HTML file works, you can always "call" the commands from a custom link as seen in my Tips & Tricks thread:
http://forums.x10.com/index.php?topic=21436.0Then you could make your own page that sends commands to the X10 page, and then hit the back button when you're done.
Another much easier alternative is getting X10 Commander. You can use that on the iPad, and then leave ActivePhone for smaller screens.