hyc doesn't provide any support for his stuff...
However if you're just looking for APN info:
MMSC:
http://mms.sprintpcs.com/servlets/mms
MCC: (Should be 310)
MNC: (Should be 00)
I believe this is right, I'm sorry I keep switching things up and I haven't tested MMS in a while.
Edit - just had my gf send me a MMS - worked as well as you could expect on Sprint (there's an issue if the message has text as well as a pic - Sprint mangles this, which is an issue on native devices as well, nothing to do with our port. hyc, however, coded a workaround so Sprint's poor handling is at least partially circumvented.)
Edit 2 - to expand on the above, basically the picture appears as a slideshow - it seems the fix on native devices is to show the slideshow at 8s - so it would "play" the still frame of the pic for 8s. hyc fixed this by pausing the frame completely. I'm going to suggest the native form, we'll see how that goes over
.