Okay so I customized a few apps and I want to know how you would go about installing those ipa's on a jailbroken iDevice. Yes, I have Installous.

Same as you would on a normal iPhone.

Make sure you have the updated installous- Go to cydia, it should automatically detect upgrades - Select "complete upgrade", or something like that.

Go to itunes, drag and drop your ipa in the app tab. Plug-in your iphone. Tick the box that says synch, then tick the apps you want installed, then click apply on the lower right side of your itunes; iTunes 10.2.

Enjoy