1. I think this isn't an exactly "in demand" feature, and as, from reading your situation, I should imagine it will take a lot of time to implement, I don't personally think it's worth it. *Most* people have mIRC just for themselves. The only people I do know who have an entire family of IRCers have separate computers. Obviously, it's not practical for everyone to buy and network 3+ computers, but it's equally impractical to put a lot of hard work into a feature which could (and I think probably would) confuse many users and which wouldn't be used by a large amount of people.
2. I suppose it would be OK to have an option like this, but it would cause huge confusion without the Status windows as "markers", or at least for me it would. But customisation is what it's all about, and I guess if you wanted this feature it wouldn't be too hard to put in. Again, I don't think it's at the top of Khaled's, or many other people's "wanted" lists.
3. This has been implemented, quite awhile back. You can now use
/server -m irc.server.here. I don't know how you didn't know about this, but did know that the irc.server.org status windows separated different networks?
4a. See
/help on connect4b. If you don't put anything in 'All Networks' and specify different perform commands for different networks, then connect to a network that is not one of those networks, no perform commands will be...performed! If you go to the Perform section you can click 'Add' to only have Perform trigger on certain networks.
5. I agree with this, there should be an easier way to change it. A bit like the
ALT+O > Other section where you can choose what the line separator character will be. If you really want this right now however, there are a number of threads which have the code necessary to change it. Try
this thread.
6. Again, this would have to be a customisable option IMO if it was to be implemented and definitely not enabled by default. In fact, I think it could be annoying too. If there's a new channel message, and you're looking away from the screen for a second, then the switchbar flashes...by the time you look back it might have disappeared again and you've missed the fact there's been a new message until you manually check by hovering the cursor. A little tedious. And if you're in quite a few channels, there would keep being channel messages and the switchbar would be almost constantly flashing, therefore making the whole thing pointless!
Edit: Not exactly what you want, but you might like to know that you can choose to hide the switchbar in 6.14 (and versions before, don't know until when) -
ALT+O > Display uncheck the 'Show switchbar' box. You can then access channel windows through the Window menu.
My 2 cents
Regards,