staredit is usable for every player in the battle net.
modding makes the game different, each player have to download it, and in some cases, they are not online -playable... but... yea if you could detect what unit you were clicking... maybe you should ask a more pro person...

might be done with a simple eud trigger.
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Ok, I realise that I can use Arsenal III, and am competent with doing so. But I was wondering if there was a way of doing this that didn't stretch beyond editing the .scm or .scx
If it is down to complex triggers as you suggested, it's probably beyond me...