Really falling in love with your product here and have a search engine optimization suggestion for a future revision of it.  I am currently running 4.1 so I'm not sure if you have already planned to implement this into the next revision or not.

Essentially the Permalink URLs should be nested within eachother for optimal keyword placement for forum / subforum builds.

Example:

Forum A

SubForum A

SubForum A1

SubForum A2

SubForum B

SubForum B1

SubForum B2

Forum B

The URLs should be structured as such

…/forum-a/

…/forum-a/subforum-a/

…/forum-a/subforum-a/subforum-a1/

…/forum-a/subforum-a/subforum-a2/

…/forum-b/subforum-b/

…/forum-b/subforum-b/subforum-b1/

…/forum-b/subforum-b/subforum-b2/

../forum-b/

Why this is useful:

Titles can be SEO with very little effort.

Example:

Technical Support

Lenze Manufacturer Products

The SMVector Product

The SCM Product

Corresponding URLs:

…/technical-support/

…/technical-support/lenze-manufacturer-products/

…/technical-support/lenze-manufacturer-products/the-smvector-product/

…/technical-support/lenze-manufacturer-products/the-scm-product/

Just a thought, keep up the good work!