How about an options manager?
Kind of like a batch file like we'd set up in the old days to run several things on startup.
Give us a spot where we can select to run squelch list, .join, & other options on starting the game.
Call it what you like, but give us a button, which would pull up all available options. Along with a window where you can squelch at least 3 people on startup.
If your worried about a permanent squelch list make it limited to just 3. Everybody should have the ability to ignore that many.
Considering that some people would maybe like a squelch list that would hold 300, three seems pretty minor.