yes, TC stops, yet with SH3/SH4 I usually let it run while I do other things, because I find it a less stressful approach to the sim, than using a high TC, while staring at the monitor waiting for something to happen
and I've found very useful in SH3+GWX to hear a louder (than SH4) warning call (aircraft/ship spotting), coupled with the dark grey dialog window that drives me to the PC, in case I did not hear the call
so with SH4 I'm missing that feature, because I'm compelled to stay near the PC more than before: as a matter of fact, although being on my first assignment, I already had to reload 4 or 5 times, being badly damage by recon aircrafts .... that in this huge sea seem to find me quite easily ....

..... ... ..... where are the ships?