Unfortunately, as you've discovered, a lot of the tweaks were originally designed for the iPhone and don't work well on the iPad.
All I can suggest is (1) contact the developer to see if they have any plans to, or can update the tweak to run on an iPad, and (2) be extra cautious when installing tweaks on an iPad. Always make sure they work by checking to see what other people say about the tweak (or asking about it here at this forum) - all before you buy.
I had it running on my iPad1 with iOS 4.3.3. It was pretty cool. Sorry it's not working for you on iOS 5.
Marilyn