I'm not sure how to ask "the GhostScript folks" about anything, since I couldn't find any way to ask questions directly of people who work on it, and there's no tech support people. It's essentially an open-source project, although there are commercial versions of it. I found a usenet news group for PostScript where a lot of people ask GhostScript questions and asked about OpenType font support there, and got no response.
It turns out that OpenType fonts do work in the latest version of Ghostscript (I found out simply by upgradng and trying it), but they didn't for some reason in the earlier version I had, although I could find no mention of recently added support for them, and had seen some indication that they were supposed to work in previous versions. I wonder if I had something set wrong in my previous installation.
I had contacted FontLab and they said their TransType product does not currently support conversion from OpenType fonts, but an upcoming version will. However, I have no need to convert them to Type 1 with the latest version of Ghostscript.
I'm using GhostScript to rasterize PostScript and EPS files in a batch process, by the thousands.
- Dave