Looks like we have a new version of HTC Messages out now!
1.5.2014.3625
http://forum.xda-developers.com/showthread.php?t=676159
I've installed it and it works very well -- much snappier than the previous versions on my TP2. Being on Sprint, though, no MMS is a real drag. I am hoping that the release of the new, better-performing version might reignite some of the interest in getting Sprint MMS working.
I would actually be content setting up jMMS to only receive MMS, and using sMMS to send MMS, however I can't seem to distill those instructions out of the thread. Can someone who's had success with such a configuration either point me to the post number, or give me the setting for Sprint to receive-only MMS using jMMS?
I tried installing Arcsoft for MMS features on top of HTC Messages, but it the Conversations would get really confused if the last message from a contact was an MMS. It was also strange to have to open the old WM Texting app, because sometimes I could open it, and other times it would open HTC Messages instead.
EDIT
Answered my on question! Here are the settings for Sprint receive-only:
Server Name: (Whatever you like (default is SampleMMSC))
IP Address: (blank)
Port Number: 80
Server Address: http ://mms.sprintpcs.com/servlets/mms?X-SPRINT-MDN=8885551234 (replace with your phone #)
Connect Via: Sprint
Send Limit: 1024
WAP Version: None