One such and the only one that I would like to see is PlanetSmasher's Artillery Pit at least tested by the community in large scale, and I have fought for this for perhaps 2 or more years now.
That's not going to happen. Don't get me wrong, I'd love UKF to have a practical indirect fire weapon team. But it won't happen.
With the exception of the commander revamps Relic wants the balance team to balance the game, not redesign it. They only get to make minor tweaks: costs, prerequisites, stats. The one man Soviet sniper came from Relic itself, as apparently did the popcap rework. If things as simple as UKF snares or ditching Bolster were vetoed outright I can't see something as major as the artillery pit ever getting the go ahead from Relic.
That Artillery pit will likely never happen and complaining to the wrong people isn't going to change that.