Okay, my views (and ONLY my views, so hopefully nobody gets heartburn or takes it personally,

1: I have no desire to add on any kind of Chat/Facebook/etc. feature...I just want to come to this site, read and post....I'm in my 40s...I've never been on Facebook or Twitter and really don't plan too; so old-school 'read and post' on this 'message thread' on 'this site' works for me. Hopefully that's not too much of a problem for everyone else...
2.: I have no issues with the posting being at regular intervals (i.e. every Sunday or every Sunday and Wednesday; or every 72 hours, etc.) or a more generic...'when it seems like a decent amount of time has passed' per GM judgement. I'm good either way. I might not make every interval, but I have no issues with the GMs advancing the action as needed.
3.: While I haven't run anything on this site in a LOOOONG time, I have run games on other boards and the primary lesson I've learned is this: Trying to set up situations where a group of PCs have to figure something out or have a lot of options doesn't usually work very well. As somebody else mentioned; keep the action fast and furious or free-form (i.e. talking in the barracks, etc.).
4: I very much enjoy the stories that the various GMs have run on this site and am happy to continue whether it's a Squad/Team of 3 or 4...or whether we've got a dozen plus posting.
Hope this helps!