Back when Westwood was still active and had a had active forums I suggested that a new class be introduced to both sides. It was liked by most if I recall, but I believe it was Divinoch ( I probably murdered his name it's been soon long ) said that due to limitations that it couldn't be done.
The suggestion was for a dog unit. Faster unit then all normal infantry. Does the typical one shot kill bite attacks if enemy units got close like in the C&C games. But more importantly, at least for GDI. They can, withen specific radious around them, see invisible units. They can also bark, which makes the enemy stealth units flicker, which can help make them be seen by your team. Works on both SBH and Stealth Tanks.
Not sure if worth it or even possible. But eh.
Always felt that Nod had a huge advantage when defensive structors were down or not present. Heck, people used to use enemy harvestors to get past the advance guard towers a lot on specific maps pike cities. Out of curiousity, can you still plant where a harvestor sots to put tiberium into the refiner and have the harvestor make it block any attempts to disarm the beacon because it's sittig on the beacon?