Welcome to MobileRead, DojoPat!
Yes, this can be done. Have a look at the stickies in the Reader Developers' subforum
. I don't think it has a specific remapping of the enter button, but there is one for remapping the jogstick to turn pages in the Hack Builder
If you really
want the Enter button to turn your pages, you can arrange it easily enough with some tweaks to the appropriate XML file.