How can I let VideoHive authors to freely use my tracks for their projects?
They freely can.
Just let them know, that they can download your preview files (in the AJ audioplayer on the right end of the timeline) and use those watermarked files for their projects!
Thanks guys
To follow up on the question: I am assuming its frowned upon to advertise yourself in a VideoHive forum saying you’d like to collaborate?
I thought I knew English. Frowned equals banned? If so, it’s not. Many AJ authors are doing it.
It’s allowed, to ask in the VH forum for collaboration, i asked the support for this once. So i did it. But the result was: No reaction at all 
Don’t think that posting new thread on VH forum is a good idea. Here is topic about it, and what VH authors think about our proposals on their forum:
http://videohive.net/forums/thread/audio-jungle-portfolio-posts/54013?page=1#493051
If your music useful, VH authors will find it independently.
Thank you guys for the comments and D Cooper for the thread! I think I’ll shy away from posting there
That’s what Videohive authors think about your collaboration requests:

As seen here.
I’m on another site where 99.9% of posts and PMs are ” please listen and comment on my music and I’ll do the same on yours…”, which is utterly annoying and pathetic in my opinion. So I totally can see where VH authors are coming from. I’m only glad it’s not allowed on AJ.
