Another thing I noticed is the HTC qwerty keyboard is a big fat 7mb. Does anyone really need a qwerty keyboard for this phone. Maybe move it to data for the extra space.
gmail.apk is outdated also and since its now a separate app it would probably be better in data instead.
Same with adobe flash. since it will get updated often it will end up in data anyway.
It may just be me but specially with sense ROM's any space that can be saved in the /system/ will just give more memory to use.
I don't have any FC's using the mail.apk with my exchange server.
i wouldnt update flash pretty sure you need the hexedited version it for hulu