I'm definitely comfortable with geekier wiki editing. I'd already broached the idea with another of the admins. I'm a 15+ year veteran of en.wikipedia (where I'm a TemplateEditor, PageMover, etc.; not an admin - that job is mostly politicized psychodrama at a site that large).
All in: Yeah, the "approximately 2 days" STEP 3.0.0 setup was about a month for me! I was taking extensive notes, like every single patch available in a FOMOD and on its download page, where typos are, what mods recommended have actually been abandoned and replaced by new versions at different Nexus mod ID numbers (at least three, and I'm responsible for one or another of them), places where the advice in the guide seems inconsistent, mods STEP recommends which were never updated for USLEP (so I went and patched them), etc., etc., etc. Some of what I've been up to will make it into a user-level guide page instead, and isn't main STEP Guide material - things like integrating Ethereal Elven Overhaul (wrote new patches for that, too). So, yeah, put my OCD to work here. >;-) I'm not a primadonna, self-promotional modder; I mostly write patches, with as few restrictions as possible under the Nexus circumstances, and give away most of the donation points or mod rewards or whatever Nexus calls them now.
I'm aware this site uses some particular and complex MediaWiki packages, and promise to pore over their documentation before wading into any code I don't understand. I think the most complex thing I have in mind would be tracing a transclusion chain of templates and modules to find where ever some particular text "lived" to update it there.
I also wouldn't make any substantive changes (like which mods are recommended, etc.) without vetting it, of course. I'd already been lurking in some of the STEP LE 2.x vetting threads for a couple of years, actually (like the debate about Skyrim Realistic Overhaul and what to piecemeal replace it with, before it suddenly came back).
Some "résumé" points:
* Latest patching work: Unofficial Skyrim City Patch (USCP) Reawakened
* Directly STEP-relevant: AI Overhaul for USLEP
* Ditto: Waterbreathing Breathless Emerge for USLEP
* I was also the most extensive mod tester for OpenMW, but my user page at their wiki isn't up right now; they're overhauling the entire wiki since a month or two ago. Edit: I found where it was moved to. Includes my Morrowind and OpenMW companion/follower guide.