Okay, speaking as myself and not an admin...

I personally see no problem with a patch if it is just that: a patch, and not the modified result or the original program. For example, the plusifier in jj2+ applies a patch to jj2.exe, but does not contain either the original or the modified jj2.exe (and so it's completely useless without actually having jj2.exe). It's more dubious if the "patch" is actually a set of modified files that still need the original program installed to be useful, and I'll punt to the other admins for that as they own the website

/me puts admin hat on: Abandonware is much more clear-cut, and is still prohibited here. That includes JJ3.