downloadsquad has a nice page of tips for customizing your install of Opera Mobile Beta 8.65. I really like Opera mobile but always stop using it for one reason or another. Odd, that. In any case, this just may get me reinstalling again, since it looks like it will be a little while before the stunningly cool-looking Opera 9 for WM is out.
But if you're willing to edit a few .ini files, here are a few ways to customize and improve Opera Mobile.Making a page down button, and other navigation settings
Read: How to make Opera Mobile even better (Thanks to Mike for the tip).