We just don't see a ton of people using the raw log support, so it's not something we've focused on. There's nothing in the near term that will change this explicitly (either by documentation, by feature development, or new connectors in the works).
It's technically relatively easy for us (usually) to create raw log-only connectors provided the file naming and rotation conventions are pretty well known, but as it stands right now without some changes we would be careful about 'releasing' them since it might create confusion as to what we actually support (i.e. normalize) and don't (when I did this for myself internally, I called them "nDepth Only" to make it clear, I couldn't keep them straight myself). Effectively we build a connector that drops all normalized events in case you happen to select that option and has the right category/name.
A better solution would let you input those things and be more like the "generic" connectors we've discussed on and off (that's kind of what this is anyway). But again... no promises