I created multiple extensions of the site to both improve how I managed it, along with how people interacted with the site.
Although it was a WordPress base I created a secondary, modding specific, backend. This tied in with special WordPress plugins I wrote to enable the interaction between the site and the mods.
I also wrote a specific ModHub Downloader application which let people download mods directly through the app (and install the mods for them) or by using the URL protocols that I embedded onto the site.
Unlike several other modding sites, ModHub's submissions had to be accepted before appearing on the site. Due to the acceptance process the quality and array of different mods was high and spam was non-existent. The flip side of this was that the process was slow and required staffing, something I did not have the largest amount of time for.
In many respects ModHub was my largest learning opportunity, it had multiple ups and downs (servers overloading, community exploding) but I learnt so much that it still affects how I approach projects to this day.