I haven't actually tried this, but this is what I'm planning on doing before I start PVPing again. (I'm only level 36x3, so I switch off between leveling and PVP).

My current set up is 3 warlocks on one computer. Controlled through Keyclone and primarily using a Nostromo N52 Speedpad. The N52 has a "red shift" option that lets you shift between keymappings on the fly. (Three or four keymapping I think). So I'll just have each character have 2 assist/follow macros, plus a blank spot for when they're lead. So if Ryanone dies, I can hit Red Shift, go to Ryantwo's screen and just start playing the remaining two. And I could just leave it like that, or once he resses I could hit it twice (Once to go to Ryanthree main, and then back to Ryanone) and go back to Ryanone controlling.

This has some advantages and disadvantages, of course, but this is probably the method that will work the best for me. I have already managed to run the WSG across a field where all three of my characters died, but the next one managed to grab the flag before Alliance did. (I had the first character to die just autorun towards middle, and when he got in range I hit my /follow macro) But that was a lot of luck and alt tabbing so I could hit Autorun on some of them.