Conditionals would be cool.
I'd love for the macro capabilities to be powerful with variables and conditionals and the ability to play a sound--like a mini programming language. It would really allow a great amount of capability in the program for those that want to use the extra capabilities, but would still be simple for those who don't need the extra capabilities. I'd love to see the macro capabilities expanded out.
Can you imagine:
if(/r 1d20>9){
play "SwordClankFX.mp3"}
else {
play "SwordWiffFX.mp3"}
}