Another option would be some sort of "help" beacon. Of course I would be the one always using it. Seriously though, I think Dawn of War had it
As far as other in-game comms, I much prefer voice over text. I have not played NTW, and am sort of in the middle of the road when it comes to games with onboard voice. In addition to external chat programs, I suppose steam could also be used but I have never tried it for more than 2 people.
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