for easier moderation purpose when you want to restrict certain forum section where as x forum count is required only?

At this precise moment in time and most likely in the future?

No.

Not possible.

IPS only counts total content items.  

 

A workaround is to utilize the Automation Rules app by @Kevin Carwile to build your own promotion and membergroup system.  

Per @Lindy this will be something in a future release as they are stored but currently they are all combined.