Jerry,
You'll be happy to know that your VX2100 is safer than your motorcycle and less fattening than beer. The bad news is that your videography hobby is likely to be more expensive than 24/7 poker.
I don't have a lot of experience with basketball (never got into watching a bunch of guys run around in their shorts!), but if you're getting good results with auto focus, I'd just hush up about it and let everyone think you're doing it manually! X-D Seriously, auto-focus is great but it comes with a price - those brief moments when it focuses on the far-side bleachers, or the other side's cheerleader (wait, maybe that isn't so bad after all!).
You might try a manual setting that is about halfway between the normal close action and normal far action. If that works, you're set! (I still would let other videographers think I was manually focusing - just put your hand there and act like you're turning furiously!)
There is nothing better than manual focus, but it takes time to get the hang of it and a lot of time to master. Play with it during practice games, when it doesn't really matter. Meanwhile, use a static setting or auto focus, if that will work for you.
If low-light isn't an issue, then why not leave that ultraviolet filter in there? (I assume that's the one you mean). Otherwise, take it out indoors. Assuming you don't live in the tropics or the artic, shutting the lens cap is often one more step than I take. I treat my cameras like good tools, but not like delicate instruments. VX2100s are tough.
You shouldn't need any adapter for your WMS-PRO other than the cable that comes with it. It will have a 1/8 mono plug at one end (for the receiver) and a stereo 1/8 plug at the other (goes into your camera.) If you want to use a second audio source, you'll either need a Beachtek 4a or Azden's on-cam mixer (cheaply made, but only costs about sixty bucks).
Thanks for the plug on our course. Wedding season has started early for us (we're nearly booked through May!) So that's slowing things down a little.