I was very much a slasher as well, but most of the people I knew, who were pretty adamantly anti- Sam/Jack, were at least accepting if not enthusiastic about Jack/Janet. She was Air Force, but as you said, being a doctor took her out of the chain of command, in the same way as Daniel's civilian status did.
One of the things I found odd about the OP was the idea that slash OTP fans wanted the main character to only sleep with guys, and if not the secondary male, then any other male would do. That wasn't my experience at all, and I find it completely foreign. Part of the specialness of a slash OTP for me is that any guy won't do, it has to be that one particular guy. So, in my experience, OTP slash fans are much more accepting of het pairings for the members of their pairing, rather than other gay ones.
Maybe that's changed more recently - I've seen a lot more John/Cam and John/Lorne since McKeller. But I think a lot more SGA fans see John as actually gay, and there aren't any obvious het pairings for him anyway, I suppose, unless you bring Sam back. (That's not speaking from being anti- John/Teyla, I'm not, just that she seemed happy with Kanaan, so not immediately available.)
Re: From metafandom
One of the things I found odd about the OP was the idea that slash OTP fans wanted the main character to only sleep with guys, and if not the secondary male, then any other male would do. That wasn't my experience at all, and I find it completely foreign. Part of the specialness of a slash OTP for me is that any guy won't do, it has to be that one particular guy. So, in my experience, OTP slash fans are much more accepting of het pairings for the members of their pairing, rather than other gay ones.
Maybe that's changed more recently - I've seen a lot more John/Cam and John/Lorne since McKeller. But I think a lot more SGA fans see John as actually gay, and there aren't any obvious het pairings for him anyway, I suppose, unless you bring Sam back. (That's not speaking from being anti- John/Teyla, I'm not, just that she seemed happy with Kanaan, so not immediately available.)