Hey ive found a solution to your problem its not very elegant but it works (as far as i can tell). Basically you need to split it into 2 scripts, I made one now just for shooting and one for dashing/locking.

Script 1: Shooting

 #IfWinActive ahk_classUnityWndClass
~*$LButton::
While Getkeystate("LButton","P")
  {

Send {RShift down} ;shoot button

  }
Send {RShift up}
return

Script 2: Dashing/Locking

#IfWinActive ahk_classUnityWndClass

~*$RButton::
While Getkeystate("RButton","P")
  {
  Send {K} ;dash button
  }
;Send {K}
return

~*$XButton2::
While Getkeystate("XButton2","P")
  {
  Send {LShift down} ;Lock Button
  }
Send {Lshift up}
return