I'm installing an ipa manually to /private/var/mobile/Applications/uuid/my app. The only problem for me is the app icon is blank? Does any body have any idea how I can solve the problem?
Did you added a icon to it in the app package?
A note: Unix comandline /hello world is actually /hello\ world.
Also the best way to create a app (without Xcode) is to get a existing app from Cydia, SSH it to Putty/Terminal or mount it on your PC/Mac/Linux Desktop, delete the script and modify the other images, create your own script, change app name and put it into your iWhatever.
Did the best to help and welcome to iPad forums and hope you will/have enjoyed your iPad.
Sorry can't help you about your other problem. I never jailbroken my iPad and I know only a little about any programming. I only know these stuff because I've got a book called "iPhone Hacks" which is great but outdated. I did my best to help you.