the best way is to follow Ian's sugguestion of the header redirect on a php page.
I get a huge chunk of my traffic from google; I've done a lot of checks of the spider compatability and it looks great, the only improvement i can hope for in the future is a "fake .html extention" like UBB.C had... Though keep in mind us UBBDever's partially a reason Infopop/Groupee does short urls now adays hehe...
For now we're working on bugs, so it'll be likely that it'll be a couple of months until 7.1 gets out... I'm sure the picture gallery and newer features will come in each full release, but we'll all be on the lookout...
I can't really comment on the others as I'm not a .t6 user...