While not technically a word, "omnibenevolent" is often used in theological discussions. Try typing it into yahoo.com and you'll see tons of hits.
While the folks at Webster might not call it a word, the meaning of the (non)word is still fairly clear, especially as it almost always coupled with the related concepts of "omnipotent" and "omniscient."
What a stupidiculous side issue in an interesting discussion, though...

Scott - interesting point on free will. My argument for free-will and determinism is this, God or no God:
There is but one timeline in the past. We don't have alternate memories of events from previous times in our lives, but we know of only the one possibility that occurred. Our perspective on things may change, but, basically, I know that I ate a cinammon muffin this morning, and I wasn't simultaneously wrestling a bear.
As far as tomorrow morning goes, I can currently envision the possibility of either eating a cinammon muffin or wrestling a bear or doing a multitude of other things. So it sure seems like I have free will, which is nice. But, in the end, I will only do tomorrow morning what I choose to do tomorrow morning, and I will have had no option in the grand scheme of things. I will not have simultaneously been in several places at once, so clearly the path has either converged to a single line (if you buy free will) or the path was a single line all along and I only believed I had options (if you don't buy free will).
The difference between free will and determinism is irrelevant as long as we don't know the future. Thus, even if we believe in determinism, we are forced to live as if we believe in free will, since we have no idea where our paths, though inevitable, may lead.
Of course, if you believe in God, this is tricky, since technically He should be giving you the option to believe in him. And if you buy determinism, presumably God would know where our inevitable fates all lead, and this whole thing is probably very boring for Him and pointless for us.