Bill W4ZV wrote
To cut the 4 second timeout to about 1 second, you can send "..--" (IM prosign, for "IMmediately exit").
Yes, but how to do that *from the terminal* is what he asked. I assume, by that, he meant using KY commands to send messages.
My KComm program is capable of using terminal mode to send RTTY and PSK31 but because of the inability to do end the transmission quickly, or send newline characters, or differentiate between upper and lower case (not important for RTTY, obviously) it isn't a useful capability at the moment.