your basically right but your example is wrong, you can change the mover of a unit with upgrades. i'll do exactly this in queen survival with broodqueen upgrade.
to the problem:
you can change a hell lot of things in upgrades but you cannot make it trigger something in actors (upgrade.add doesnt work for me as event). easiest way is to replace the units (as i do in my map planetary cleaning service - check it out it might be exactly what you want) with triggers. just use research finished as event , then pick all units of type, replace selected unit with merc. if you have a train ability add your merc to it, create a requirement with the upgrade, one for the marine and one for the war pig. put them on the same slot and your done.
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omg what a overkill
@Photoloss: Go
your basically right but your example is wrong, you can change the mover of a unit with upgrades. i'll do exactly this in queen survival with broodqueen upgrade.
to the problem:
you can change a hell lot of things in upgrades but you cannot make it trigger something in actors (upgrade.add doesnt work for me as event). easiest way is to replace the units (as i do in my map planetary cleaning service - check it out it might be exactly what you want) with triggers. just use research finished as event , then pick all units of type, replace selected unit with merc. if you have a train ability add your merc to it, create a requirement with the upgrade, one for the marine and one for the war pig. put them on the same slot and your done.