Here you go! It was made by "Frez" over @ XDA:
http://forum.xda-developers.com/showthread.php?t=539122
I also use it and love it!
It'll allow your manila to retract the bottom slider tabs in portrait mode like it does in landscape.
Also note that Fredz also states that it is for "RHODIUM" which also mean its Manila 2.1. I never tried it on any other versions.