Ok what qnc suggested worked for the Mail app, but there are other issues I've just discovered that made this seem impractical anymore. Sorry Siri but maybe we'll meet again in iPhone 5
btw, the issues I've had were random crashing in Photos, Flipboard freezes, Camera app blackout but still able to take photos if you press the capture button (ie. photographing blindly), Facebook app freezes when viewing friend's timeline, Safari loads noticeably slower but not too long...I'm sure there are others but I don't have the time to test the 200+ apps on my iPad.
I'd like to help out in finding the bugs but I need to use my iPad for work and just today the Photos app crashed while I was presenting to a client so...yeah...I must remove Rainstone for now. Sorry but best wishes to Cooldayr and thanks for the great port!