As far as I'm concerned, the more games the better - the drop / starting 1st or 2nd etc even out more then. In fact this would mean that I would challenge for more maps again, rather than just sitting on Waterloo like I am doing at present, as the result will be more based on the decisions I am able to make.
I have also never used different settings, so I am perfectly happy with having a single set of settings. This tournament quickly became too much for Coleman to handle, and we need to make sure that it remains in a form that is doable for you guys (thanks for all your efforts to date

)
The challenger choosing settings for a small proportion of the games seems like an interesting idea too, but IMO should be limited to 4/1 or 5/2 at most.
The downside to having say 7 games per challenge is that the leader could be suddenly swamped with 50+ games in a single week - if that happened to me I would probably choose to relinquish a map or two, which doesn't seem like it is in the spirit of this tournament - something to think about anyway...