Very good post! I highly emphasise on suggestions 2, 3, 4, 5 and 9. The Legacy friends option, friend their legacy, and then have the convenience of being able to contact your friends, regardless of what character they are on. Make use of Legacy more, this would exactly be like the tool that battle.net uses with its RealID, except it would be server-only. If I interpret right with regarding 'mega-servers', then this would be another great feature to have in. Of course, give players the option to opt-out, if they value their privacy.
Community has always been an important aspect to an MMO to most players. I know bioware gets that, the LFG tool is a step in the right direction. But more simple tools like a better UI for channels to being able to moderate said channels, the commands are there to do the typical /kick, /moderate etc. But newcomers won't be able to get that, unless they do further reading, and it's a pain.
Channels that are also easily accessed to the opposite faction ALSO helps a ton with community building, if we don't have server forums (server group forums are meh), then this I reckon is the next best thing. I'm an rp'er myself, casually, and I help organise regular server-wide rp events, having everyone already in the one place makes it a whole lot easier to communicate and organise, rather than having to log onto the opposite faction and then advertise the event again, making it a tedious task. Yes, we could use third party applications, or methods (VOIP, forums etc). But this is just a much more convenient way, and everybody spends majority of their time in-game. I'm not only speaking an RP's perspective, but there are many events I've seen that servers are doing, and they look fantastic. The Jung Ma world PvP event for example, you'd do them great service by implementing features such as cross-faction channels. Even encourage other server communities to create server-wide events such as that.
Please take note, bioware! These simple-sounding features are great luxuries to help build/enhance server communities together.
Again. Thank you, OP.