Wish you Magic Mouse could do more? I certainly do.
When it was released, a lot of people said that developers could potentially make improved drivers for the Magic Mouse so it could perform extra gestures and advanced things like that. There have already been a few utilities that extend the functionality of the Magic Mouse but I've found one that actually does a good job, so far.
MagicPrefs is yet another application that sits in the menu bar (as if I don't have enough of those!) It adds support for extra clicks and gestures, I haven't fully explored all the options yet but there's an option for middle click, two finger clicks, three finger clicks, three finger swipes, you can even program functions to the Apple logo at the end of the mouse.
The coolest feature of MagicPrefs is an image of the Magic Mouse, when you touch or click the mouse, an overlay shows where your fingers are in real time!
So far MagicPrefs is pretty good, I've only got middle click enabled but I haven't activated it by accident yet, everything seems to be working as it should.
Anyway, check it out, play around. It's free so you can't loose.