F10::SetTimer, Cycle, % (IsStart:=!IsStart) ? -1:"Off"

Cycle:
   Send, {vk26 Down}
   SetKeyDelay, 10000, 2000
1:
   Send, {vk25} ; i
   Sleep, -1
   Goto, % IsStart ? "1":"2"
2:
   SetKeyDelay, -1, -1
   Send, {vk26 Up}
   Return

F12::
Send, {vk26 Up}
ExitApp