One of the more boring profs are no doubtedly the soldier, or at least many soldiers have told me. I have 3 suggestions that would make them a little more interesting
Missile Launcher
Introduce missile launcher that would work like NT area damage nanos. This would be a very usefull addition to a hunting party.
Special attack grenades
The fixers have special ammo they can use, why not the soldier. Introduce grenades as special attack form and let them do area damage as the NT area damage nanos.
Cannon operation
With the introduction of the Engineer cannons (see other thread), maybe the soldier would be better fit to use them than the Engineer themselves.
The Art is in there, now use it!