I just wish there was a way to enable breaks from console.
By "enable breaks" do you mean the "BREAK causes the OS to jump to the PROM monitor" stuff that SunOS (including 5.x) does?
We don't detect BREAK or respond to it, but there's probably no reason we couldn't do that.
I don't know if our serial port is set up so that unplugging a terminal (or terminal server) and plugging it back in looks like a BREAK; that's one of the suckages on at least some Suns.