You should be able to just do something like:

Code:
<MovementHotkey ScrollLockOn Z>   
<SendLabel w1>
     <Key W>
<SendLabel w2>
     <Key D>
<SendLabel w3>
     <Key A>
<SendLabel w4>
     <Key S>
As far as I understand, that should send the desired movement keys* to each client for as long as you keep the hotkey (Z) held.


* If you are not using WASD for movement keys, you would need to edit the keys being sent to match your ingame keybinds.