Welcome! Yes, this is a good place to ask questions regarding Rebol. I was once a skeptic of the idea of making a forum (I preferred our chat, GitHub Issues, Trello, StackOverflow Q&A...) and wondered if it would just be a burden to have another "place". But I think it turned out to be a good medium for longer-attention-span discussions that don't fit elsewhere.
(Note that for Red, they do most of their support on Gitter... here is their list of rooms)
The ODBC support was an attempt by me to get the ball rolling by hacking on an R3-Alpha extension written by Christian Ensel so that it could work in a minimal sense. I don't know how true that extension was to Rebol2, as I have no real experience with historical ODBC in Rebol (I did not arrive on the scene until the R3 times).
So over the span of a week or so I managed to get something going, against MySQL's ODBC driver on Windows. I concocted a single test file to see what it could do:
https://github.com/metaeducation/ren-c/blob/master/tests/misc/odbc-test.reb
That's about as far as we've gotten, though it's better than nothing!!
So I don't presume to know what it should or should not do. It's mostly on those in the community who have a stake to come in and say what it would take for them to feel engaged and want to be involved. I've got a lot of questions about the PORT! design in the first place, and I also feel like there's a lot more STRING! use than I'd like to see for a dialect. One of Rebol's strengths is supposed to be DSLs, so it would seem a smoother and more integrated SQL using WORD!s and such would be an objective...
We could definitely use some more developers to hack on it with us. C programmers would be great 
but even writing tests and defining what it should do helps.
In any case, please feel free to introduce yourself and your stake in the project here!