here is what I use:

<UseKeyAsModifier Oem3>
<Hotkey Oem3 LButton, MButton, RButton, Button4, Button5>
<SendLabel w0, w1, w2, w3, w4>
<ClickMouse %TriggerMainKey% Both Window Scale NoRestore>

and have no problems, not sure why would yours doesn't work (maybe the Scale or Window ? or Both ?)