This is moderately different to my title -- short story is that I'd like to be able to upvote questions/answers on StackOverflow, but am likely to only ever participate interactively on CrossValidated. I hope this is an OK topic for meta.
I'm a biostatistician -- so I use StackOverflow quite a lot for advice on various bits and pieces of programming, and would like to upvote the useful help I find. But I only have reputation in CrossValidated, since this is where I can usefully help people out with answers (I hope) -- I wouldn't be much use on StackOverflow. Also, pretty much every question I might want to ask on StackOverflow has already been answered (which is good for me, and why I'd like to be able to upvote things!)
Anyway, I'm wondering if people have ideas about how best to approach getting reputation on StackExchange, given that I'm very much a browser/end-user there (and don't want to jam things up with questions that have already been answered) -- I do often get useful help from answers that seem to be orphaned, with no upvotes.