I mentioned this in a "list of what not to repeat" thread recently, but I wanted to mention it separately.
Partly by way of suggestion, and partly to get the sense of the community.
CoH had minimum team size requirements for every TF/SF/Trial. These became almost laughable late in the game's life cycle as folks managed to defeat this content with smaller and smaller teams. Eventually many if not all were soloed by some intrepid soul.
Now I soloed only a fer few (Posi, ITF, hero respec etc) but I ran all with a dedicated duo or trio of friends and having to recruit fillers really got old. Simul clicky mission objectives were even worse (gives Dr Quarterfield and Cavern of Transcendance the stink eye*).
I understand, and agree with encouraging teaming but please do not implement this kind of content gating.