Key combination with Key(#X)?

[Gintaras]

This is the fastest, faster than key a(#100), but can be unreliable (too fast):

spe; opt keysync 1
rep(100) key a

Slower and more reliable:

spe
rep(100) key a

If still too fast, use this:

spe 1 ;;if too fast, try 2...
rep(100) key a

Then restore the speed if need:
spe 100