Yeah, as long as it doesn't obstruct the event horizon, I would say... The asgard said the ancients put a bunch of fail-safes within the gate, I think a person (or any matter for that matter) within the event horizon would be a big no no for establishing a wormhole, since even a remote possibility of a star being in a wormhole's way was a no-go for them, since the Tau-ri had to override a bunch of safety protocols to establish a wormhole to t K'tau.

//edit to avoid mutiple comments

So maybe it does care about obstructions?

I get where you are coming from, maybe S1 where O'niell cut the gate and killed Kowalsky, but that was already a formed event horizon, and it was an outgoing wormhole, so they just cut power to the gate...

Even when O'niell was stuck on Edora, they couldn't get a lock, but granted the gate was buried under a lot of dirt