Clearly some of these have been asked before!

1. Ability to put messages from multiple numbers into the same thread. Message from num XXX and num YYY both go into the same thead.

2. I would like to be able to add/drop a recipient for a new message launched off an existing thread. This is available on the default text app.

3. Ability to squelch notification on a thread by thread basis with an optional time limit.