Subsim isn't really a mod forum.
The "search" function does work, but the search database has been cleaned out repeatedly, since I think it keeps getting overflowed.
There is a mod thread in the workshop boards, but no one has organized it in a long while. Still, there are a lot of mods in there.
If you want mods, go to
http://www.u-boot.realsimulation.com/ and you will find them. That site is actually dedicated to SH3 mods.
That's all I can think of... Actually, if you hang around these forums long enough, you'll grow to like it, despite some of the disfunctional features.