Well I found something that seems to work. I am not really keycloning here as almost all commands are separated so that one character has Alt and Shift, while the other character has Ctrl and unmodified. but there are a couple of exceptions, like mounting horses. The <Key F2> simply selects the party leader so that member #2 can assist against the same target without worrying about targeting... or will heal instead, depending.

<Hotkey Actionkeys; Shift ActionKeys; Alt ActionKeys; Ctrl ActionKeys>
<SendLabel w1>
<Key %Trigger%>
<SendLabel w2>
<Key F2>
<Wait 50>
<Key %Trigger%>
<Restore>