Look, OP, no offense, but since you're a bit new to this community, let me tell you a little bit more about how things are around here at the moment.
Noone's really competitive anymore. I mean yeah, some people like to solo, they like to do it fast, they like to challenge themselves and try to improve as much as possible... But they are only being competitive with themselves. If the various Techno, Slasher, Alquinn et al feel differently, they should feel free to correct me, but I think the competitive spirit, meant as a competition between players, in this game, died a loooong time ago.
There was a time when people would compete over who soloed the fastest, who soloed the fastest with a certain kit, who soloed fastest without rockets, who duo'd faster... You get the idea. I think the biggest competition of all these, community-wise, was the full team speedrun one, which pretty much ended up being broken to pieces once the #YoloSwag team broke sub 7. But the key point is: all this was at least a couple years ago.
I mean, I don't think anyone even tried to break Alquinn's gold record in like... 2 Years? He's the only one still trying to improve it

Bottom line: everyone traces his own line, here. Threads like the Gold Speedrun HoF have to draw their own line, sure, as Techno said up here, but it's mostly to avoid chaos. If you wanna try to improve your times with your own rules and traces, I think you should do so.
In the end, if you want my personal opinion, Crusader aim delay is a cancer and the fix is a wonderful cure for it. In light of what I already said, I see no reason whatsoever why one wouldn't want to use it.
Besides, I'm pretty sure we've had dev clarifications on the matter saying that Crusader's delay wasn't intended. Basically, every shotgun has a delay proportional to 1/# of pellets. When they introduced the Crusader, they didn't think that the delay would have been much more substantial than the others.
Edit - wish there were patches for other stuff they left as is, like blade armor and shockwave radius.
What if I told you... That there is/was a shockwave radius fix? Dunvi made it... And before you ask no, sadly I don't have it, nor do I want to bother her with asking if she still has it, honestly. Should the topic ever come up, I'd keep you all informed, anyway. I think Caratinoid was working on the blade armor fix too in the old bug fixing group, but I don't know if it was finished. I know he fixed incendiary ammo, though... Which is pretty damn awesome if you ask me. Sadly, I don't think any of those fixes survived in the HD of any reachable person here...