hazmick, I've played a couple of Buffy's playthoughs as 'Dragons Lite'. Do the MQ up to where Delphine gives you the horn and wants to talk to you, then tell her you don't have time for her. UESPwiki says as long as her quest 'A Blade in the Dark' is open and unfinished, dragon spawns are restricted to just their walls/lairs. This has worked perfectly for us. Those dragons stay on or close to their walls unless someone/something gets close. This routinely happens out in the 'hot springs flat' where the dragon on that wall things the mammoths and giants are too close and routinely goes after them.
Although I have not used or tested it, somewhere I picked up and noted a console command to disable random dragon spawns. As I said, I haven't tried it but here is the info I have:
set MQ106TurnOffRandomDragons to x (1=no dragons, 0=yes dragons)
I do know that the command: help dragons 3 will give you a readout consistent with the above command to tell you if random dragon attacks are on or off.
Lopov, thanks for the info and endorsement of Timing is Everything - I thought I recalled you saying you used it and that is what got me looking into it.