Just my opinion about how much sv_pure sux:
On my server, I chose what's allowed, so I either allow fun pack or I don't.
And you think the cheaters care if you 'disallow' something?
No, but if I don't disallow it, then it isn't cheating...
Which is exactly what sv_pure is designed to facilitate.
It fails to facilitate it. But it doesn't fail stopping modders.
Modders are doing fine.
Pure doesn't stop cheating. That's impossible. What it does is massively reduce cheating.
HAHAHAHAA. Massively my @$$. Maybe compared to a mosquito annoying the potential cheater... No wait it doesn't. I've seen enough cheaters to know that every douche who wants can and will get cheats and only IP/subnet ban stops them, not telling them that it's wrong. So sv_pure is useless at stopping cheating.
Ok fine, pure massively increases cheating, as without it there is no line to say what is cheating and what isn't.
Let me put it this way. My objection isn't so much on technical grounds. I know it can be avoided. I've never looked into it myself, but people I trust say its easy, so I'll assume it is. TremFusion themselves even distributed a pure hack at one point.
My objection is on a more "political" level. Near where I live there's a road that would make a nice short but when I walk to some places. But I go the long way, not because there are barriers or guards, but because of a no entry sign. If that sign wasn't there, I would use it, and it would be legal. As it is, it isn't legal, I know that, and as a responsible member of the community I respect that.
This is similar, although maybe a better metaphor would be a bolted-but-not-locked gate. You can open it if you want, but know you shouldn't.
While I can open that gate and ignore the sign, it makes a line. If you pass it you are wrong, if you don't you are fine.
Pure makes a very firm and easy to see line. Without it its very open to interpretation, personal bias, and culture. In some games I play, automation is embraced well beyond the point that would be accepted here.
Maybe a better solution would be to make a central service that lists all the mods, and let server "subscribe" to various category's, so I can say on my server that minor sound and model mods are allowed, but major ones aren't, and nothing that changes maps more than fps increase / decrease. Of course such a thing would require a trusted 3rd party and some infrastructure, but IMO would be a better solution to your non-existent problem.
EDIT: oops page two..
googles: Cheating isn't defined by "the elite few", it was defined by the developers, with a system in place for individual servers to redefine it. If a server doesn't redefine it, then the default stands.
