I'm currently testing out Tobii Eye Tracker 5. It works perfectly in the other simulator i'm using but I'm not satisfied with my settings in DCS yet. I have some lags that I'm sure I did not have with TrackIR 5. It definetly brings something else than TrackIR 5 as you have a much larger play area, at least that what I experienzing. I'm having some trouble getting the center view reset to work also. The "Disable" button is not working for DCS in Tobii I think, at least I have not got it to work like the disable feature in TrackIR 5.
2. I don't think DCS supports foveating on screen.