Former NAC dispatcher chiming in
When I was there, pay started at about $20 an hour (which was about average for dispatch jobs up here). There wasn't a particular pay step increase, but I was also only there for close to 2 years and haven't worked there in 2 years either, so that could have all changed. Non-union when I was there, don't think that's changed. Schedules moved around a lot, between either being 5/2 or 4/10. Towards the end when I was there we had 4/10 schedules but there was a lot of OT since we were also short staffed. There was a non-rev agreement with a few airlines (Alaska/Horizon, the former Ravn and PenAir) but it was fairly convoluted to use that I never did. We also did have a jumpseat agreement but again I never used it so I can't speak to how it was, but I do know some other coworkers used it regularly without any issues.
As to the operation, when I left we operated a 737-200 and two 737-400s. We had operations running out of ANC, HNL and MIA. The HNL flight was operated by us for a sister company (Aloha Air Cargo). The MIA flights were 767-200s operated by us for another sister company (StratAir). Flights out of ANC were to the usual "bigger" Alaska airports. HNL flights were between the other "bigger" airports in Hawaii. MIA flights were run to SJU, PAP, LIM and a few new places as I was leaving). When I first started, we also had a plane based in LRD running charters (usually auto parts) to places in Canada, Mexico and other places. From what I understand now, they occasionally will move a 737 down to the states to run charters or contracts. Only other thing I can think of at the moment was when I left, they were just starting to work on getting ETOPS cert. From what I hear, that's still being worked on.
Any other questions I can try to answer, but like I said, it's been two years since I was there. I still keep in touch with both dispatch and pilot coworkers so I could always try to put feelers out if anyone was looking for other info.