As far as what I have confirmed not to work in new iterations of PHP, the ADDT registration no longer works (nor does anything that sends an automated email because of deprecated functions) in 5.2.10 and higher.
Gunter (who is tremendous) and I discussed several other functions in the ADDT library (on one of the ADDT boards a while back) which would not work once 5.3 becomes the standard (not to mention what will happen when PHP 6 gets released). So I use what I can (like I said before a number of the light functions such as conditional regions work great and they are still huge time savers).
You could add the request for "reorder" functionality to the wishlist thread... they are pretty responsive to it. I know that a number of people, recently, have posed the very same question and WA's response has been that if enough people want it, they will seriously consider it for a future release.