Using a freestyle snowboard as an All-Mountain board??

You can basically split freestyle boards into two catigorys 1. Jib Boards - These boards are great for rail riding, small kickers, jibs, buttering, spinning etc. The will be flexaxble and will be twin tipped ( nose and tail same shape). They will be easy to ride but wont handle well at high speeds or in powder. Some well known jib boards are Rome Artifact, Burton Dominant, Ride Kink. 2 All mountain freestyle - These boards can be ridden over the whole of the mountain but are more freestyle oriented than freeride. They are good for large kickers, pipe riding, backcountry freestyle, rails etc. They can be either twin tipped or directional and will be stiffer than a jib board. Some well known all mountain freestyle boards are Rome Agent, Ride DH, K2 Zepplin. So if the board you get is an all mountain freestyle board you will be ok. Good luck with the riding.

I matters about your weight and height otherwise it dosen't matter. A mountian board is more for steep mountians and alot of powder. A freestyle board is more for a bit of everthing. Like park, pipe, groomed surfaces, powder, rails and jibbs. It dependes if you are going to ride a all mountian board just on heli skiing.