I don't think there's a lot he would/could do because of the following:
1) Dynamix (the developer) went bankrupt.
2) OP2 isn't even produced anymore.
3) Vivendi owns Sierra (the publisher) now and doesn't know a thing about OP2.
4) It's his work, and it's our way of promoting it. Why wouldn't he go for something like that?
Even if it made any difference to him, we'd never get sued or anything because he has no support behind him to sue us anything (financial or otherwise). In other words it wouldn't be worth it to sue over an old game, unless it really mattered to him.
I guess, if we're gonna be labeled as 'warezkids', it's a good price to pay for keeping a great game alive.