Oh! I hate it that I'm explaining things so badly people are feeling stupid.... <hangs head in shame> I really appreciate the help, guys, even if *I'm* too dumb to be clear <hides>
a) The behavioral issues don't include tantrums at all. I would characterize him as exceptionally easy to discipline (not that that was ALWAYS true, mind you

), babysitters and the SLP agree with this.
b) The main problems are
-a reticence to speak _or connect_ under certain circumstances,
-a "stutter" (not a standard stutterers' stutter, it's more like someone saying "um,um,um" a lot to indicate they're still speaking, but having trouble finding words -- which he also does a lot)
-"flat" affect, but not with simple sentences. His pragmatics are great when he keeps himself to 2yr-appropriate utterances.
-some wierdness around volumn
-some circumlocutions that are becomming ingrained.
These behaviors mean he sometimes appears quite aspie... which is wierd since it is REALLY REALLY plain as the nose on his face that he has no kind of ASD, no way, no how (but both his parents do, so perhaps it's learned behavior???) He "comes out" on a dime, the moment he percieves that someone is willing to listen to him. Which is part of _why_ the SLP saw his capabilities this time, when she made ready to listen, he sized her up, and gave her very precicly what she needed/wanted.
Also it now appears his former "speech delay" was really just frustration. He has gone from 12-15 month appropriate speech to the 4.5-5yr thing in 6mos with no treatment [we turned the treatment down.]
The thing that seems most significant to me is the shell-climbing behavior when he doesn't think his audience is working at hearing him. He's really very social, his social skills appear (not assessed) to be also a bit precocious. I don't want him to "give up" on people.
-Mich