Please add support of loopable sounds support in following scripting commands:
playsound, say, say2d and say3d. For example
unit say [sound, maxTitlesDistance,speed]
should become
unit say [sound, maxTitlesDistance,speed, loop]
where loop - true, if sound should play again and again after it ends.
It also will need additional command for stop playing this loop sound. Suggest following interface:

unit say ""; to stop playing.

This feature will allow missionmakers to make more immersive missions.