What about calling out? I know with GV you can dial your GV number to dial the number you actually want to call (So the recipient sees your GV number in their caller ID). It was a little cumbersome, but it worked. Does PJ have something like this?
We're not sure of the value add here and it's a lot more work to get happening (and expense of development). If there's user demand we'll obviously do it, but so far feedback has been requests for SMS and MMS support (we're ready when our providers are, which they say should be later this year, or we'll move providers to providers that are).