I only changed the properties of certain units, like protoss, marines and critters etc.
Now all protoss have regeneration ability, including their buildings, I figured it was absurd for such a race to not have any form of self-repair mechanisms and built-in healing technology in their suits , it"s not too much of a weird thing, this can mostly be seen as nano-technology + other self-repair mechanisms.
Marines are not set to both biological and mechanical, meaning that they can not only be healed by medics but also repaired by SCV"s, this works well for the original campaign especially where they have no medics . Another thing is that they wear power armor and that it is mechanical in nature, so it is a very obvious thing that it would require repairing if it gets shot too many times, a marine armor would actually break before they suffer any damage, or both at once, so no you can heal them both ways.
I also added regeneration to all Duran units, dunno if it was a good idea, but somehow it did not sound all that right to me for him to not have regeneration. Especially since we know of his abilities !
I also added regeneration to all critters, this way they do not stay with their health low forever, it"s quite a reasonable thing when we consider that they should have this, especially since they are organisms and have no access to medics ;). It"s enough that instead of having shields in order to have more hitpoints than your enemy(that"s the point of having shields) they did not even give them a means to repair themselves, don"t know how to tell this but I would gladly take a medic instead of sabotaging myself, by having no means of repair, any day. Plus that the self-repair mechanisms protoss have now are pretty slow, so it"s not all that much of a fuss.
Did other things like giving civilians 10 hp(hated how they had more hp than zerlings, or as much as a marine in power armor), also gave ghosts 40 hp instead of 45 and now marines have 1 starting armor(because they have power armor).
Infested terrans now look like ghosts and have a glaive wurm attack, they basically look like ninja"s