To the OP,
The best thing AC/2 are suited for is suppression fire as you referenced. I was giving this a try on my Vindicator this weekend just to see what people would do. Once people start getting plinked to death by a couple AC/2's they back off. There were multiple instances where folks started to push and I sent a few rounds down field to the people initiating, they all would back down. This allowed our team to flank them. I was impressed how effective it was. At the end of the game I had only accumulated around 250'ish damage... So not that effective but the mental game it plays on folks was interesting.
Second best thing is distracting them. I would jump jet to a location behind enemy lines and start plinking as many folks as possible. This would cause them to turn and try to locate me 1,000 m's out. (Vindi has 15% range increase) A lot would start chasing or a minimum distract them from my team who were already engaging them. Caused them to freak out a bit

I switched the build over to a gaus rifle and PPC and I was around 500'ish dmg in comparison. To me, taking a couple folks down is probably more important.
Just my 2 cents.