As the author of v1 (but not subsequent versions), trust me when I say you probably don't want to bother with v1. 🙂
The answers are:
Yes
Not without some review. Maybe.
I'd really rather not, but keep reading.
If you have a lab system to test, I suggest trying the current version against your controllers as they are. I don't recall if we do an explicit version check. If not--then I would expect there is a good chance that most or all things would just work. (We do support 7-mode filers, but not 7.x firmware versions.) If we do a hard version check, which you would find out during install at some point, let me know personally (direct message through here is fine). That could be a quick hack to change the version string. It would be totally unsupported, of course. Then you at least know what's possible, and perhaps that would factor in your upgrade plans. Who knows?
Based on the above, then we can talk about v1. As an initial version, it's unpolished and has few features. But more importantly, it would be even harder to support, because version 1 shares nothing code-wise with versions 2 onward. And there are exactly three people on the planet that have mucked with that code, and you don't want to wait on us to dig up the bones to troubleshoot an issue. OTOH, it was released as open source, so legally, there's no barrier.
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