If you are a satisfied SEPY user you maybe wanna check the synatx rules inside the editor and not to flush time by time.
Now it is possible with the open souce Action Script 2 compiler MTASC.
In newer SEPY versions there it is an easy thing to implement the MTASC compiler.
In SEPY IDE there is a button, similar to the check synatx button in Flash IDE. If you press and there are some errors, SEPY will go to the line where the error occured.