It seems that the back gesture on the maps app just minimize the app into card view.
I opened the Maps app and hey, the back gesture now works correctly! It also seem faster.
If you want to replace the framework:
1) Download https://github.com/downloads/enyojs/...nyo-1.0-r1.zip and unzip it.
2) Rename the unzipped directory to "1.0" (without quotes)
3) Enter via novaterm or ssh into your phone, then:
mv 1.0 1.0.pre3
(This backups the old enyo)
4) Copy the previously unzipped directory into /usr/palm/frameworks/enyo in your phone