I think having the modding forums collapsed is gonna divert a lot of trafic. Yeah, I know its only one click, but people are used to taking one look at the whole index and deciding wheter to stay or leave. The modding forums are some of the most popular, so maybe you could restructure it into the main 2 or 3:
"GR1 General Modding Discussion"
"GR1 Weapon Modding"
etc, etc....
Then when GR2 comes along just have "GR2 General Modding Discussion", etc. You know it makes sense