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The question of controlling it... I don't know. It's difficult, and those of us who have either experience or advanced knowledge don't have the equipment we might have had back home. The question of whether someone else is controlling it, I think is unlikely. I couldn't rule it out, but we mostly seem to agree that it's probably a completely natural event. Holly clearly isn't, and that's a bit of a mystery, but I'm inclined to think that that's part of a system someone set up to deal with wormhole refugees, maybe someone who got brought here themselves and has since gone home.
Anyway, for anyone who's new, welcome to Portland. You'll probably get home eventually and when you do you should forget ever having been here and arrive in the same instant you left, so no need to worry about what's going on back there without you. I'm Ianto Jones, I work in the reference section in the library during the week and I'm one of the lesser qualified resident science geeks. (No advanced degree, lots of on the job training.)