Hey, I am using AMP for quiet a while now. Just recently I thought playing Terraria would be awesome.
So the problem is: there is nearly no configuration also it automaticly starts and restarts on "stop" until you shutdown the instance itself. Also if u wanna configure command line arguments, you have to configure everything on your own (as it seems - didn't do yet cause I cannot find anything).
(Big problem here: it automaticly uses the secure=1 parameter for anticheat (which is pretty useless in Terraria))
Adding a TerrariaServer config file (serverconfig.txt), for configuration (and on the commandline adding the parameter to use the config (it's possible, but cannot find it's execution)) would solve it.
Maybe I just overlooked it, but if it's not existing yet, this is my suggestion. :)