I guess it's my turn to brag...

[Toned]

do you mean
/cast flash of light
/stopcasting

??

Option1:
/cast flash of light
/stopcasting


or
Option2:
/stopcasting
/cast flash of light

Will do the same thing.

First press option 1 cast if you press while casting it stops casting... Option 2 first press it will cast flash of light (nothing to stop casting)... 2nd press option 2 will interrupt the cast.

[BrothelMeister]

Ah, good thinking, I like option2 better :-)