Like the specialist too; maybe they could get something more. Instead of having such a high agility, couldn't they some special rule that help them in any situation they are climbing and such?
Example:
Vertical assault: Specialist are used to climb and attack in such a way that there is nothing to stop them. They treat vertical terrain as open ground (not sure that is the good term) as long as they move at their half/full move rate. So they can move up or down a wall without having to do a test, as long as they are equipped with a clip harness and a grapnel and line*
*Which makes them a litlle less agile when it comes to evade attacks, run and etc. but still make them good for the first reason they were created for.
What do you think?