My experience can confirm this as well. I've never had a rear derailleur issue after forcing in a 130mm hub, but I've also not used 10-speed. I'd only bother to cold-set if spreading more than 4mm or if it was difficult to get the 130mm hub in. It hasn't been yet.

I'd like someone to show me a frame that has worse alignment with a 130mm hub forced in than when it's running a 126mm one. Not 'cause I don't believe that it happens, but that I'm curious, and that I really have my doubts that most frames are that accurately aligned in the first place. Particularly ones that have seen a bunch of use, like many C&V bikes.