Are you sure you're ok with me doing what I want?
In any case, I'm very happy you're so lenient with me.
Sure, there might have been one or two cases out of a thousand where it wasn't possible to go back - but I didn't notice any in the first 50 hours or so, where we played without that mod.
Also, in most cases you could simply steal source from the bodies lying around. Clearly, you're meant to be able to get source back in almost every single battle.
Once I did find the mod, though, I can remember quite a sigh of relief from all three players.
I don't think a couple of instances in a 100 hour game where we might have had source powers when we weren't supposed to is quite enough to "destroy" balance.
But I played with two other people - and that makes it a bit more annoying when you all have to go back and forth, especially when you have an extra companion on top of multiple party members. That means you have to wait and coordinate where and how - because one member never seemed to realise how the game actually worked
That said, we all have our own views of what's "balance destroying" - and I can certainly imagine a certain kind of person having a problem with this level of convenience.