don't know about everybody, but you know my opinions already
honestly I'd love to see the starting plot selection routine further improved, but of course I do realize that a lot of work has already gone into it and it's not easy to make it even better than it is now. one thing I dislike is the whole "some civs like to start close to other civs" idea, what I'd like to see is all civs trying to start as far away as possible from each other. I guess that putting a bit more emphasis on the distance from each in the math there, even if it means not all starting positions are absolutely awesome, would give results closer to what I think is right. subpar starting positions could get boosted by a couple resource tiles like flavourmod does, and/or a cleanup routine like the one you use with minimal flavour.
all these complaints caused by the fact that, even when using low sea level, default number of civs and override settings, which means everyone should have plenty of space to settle, I very often see spots that would have fitted a start nicely inhabitated, while others are more densely populated. so I guess there IS room for improvement, even though I realize it probably won't be easy
edit: another thing that would be great is to make reduced and minimal flavour compatible with modify and override selections, I guess it could be possible to code it so that doviello and Illians are still considered as loving snow while the smart climate does its magic, but not in the starting plot selection routine.
one more nice thing would be allowing further customization of the flavour. for example, it would be nice to use full flavor rules, with the "remove bad terrain around BFC" routine minimal flavour gives, without the "civs like more to start in the middle of the map" minimal flavour gives, and with the "stronger effect for pushing islands out of the sea" effect minimal flavor gives.
one last thing: I don't really like what Limited flavour does. imho the ideal thing would be to make sure Illian start in snow, since it's good for them ( not tundra ) , and have only doviello get the treatment Limited Flavour gives right now, edge of tundra so it's flavourful, but not in the middle of it were they would suffer ( same thing for orcs, edge of jungle so it's flavourful but not in the middle of it which would suck
) . basically having Illians start outside of the cold area is unneeded, since they can thrive in snow just fine. you only have to make sure they don't get tundra, which is bad for everybody. so yeah, if there is NO snow available, then the Limited flavour treatment would be best for them but that's only a second best, their first choice is definitely snow.
imho if you can get this right the flavour options actually become unneeded, since the map will always yield the ideal combination of flavour and not giving anyone crappy stunting starts. then you could substitute those with more specific options like "strength of pushing islands out of the sea effect" ( 3 strength levels would be cool here instead of 2, with the strongest one stronger than the ones we have now
) .
honestly the "civs like more to start in the middle of the map" and "remove bad terrain around BFC" could be removed as options as well imho. take the best out of all options and make that the default behaviour. so full flavour rules, but "remove bad terrain around BFC" making less-than-great starts better ( adding resources similar to what flavourmod does might be helpful as well. no strategic resources though, just health and happy, with happy being considered better of course.
flavourmod has a "balance starts for food" function that you could borrow, although it needs a tweak in that right now it considers plains as bad as tundra which is not the case. I guess it could also easily get adapted to create "balance for production" and "balance for commerce" routines, with hills providing production and resouces providing commerce. similarly, since adding rivers to starts without access to freshwater is less than desirable, a lone tile of freshwater lake could be added next to flat tiles, to allow for farming without disrupting the flavour of the map placing rivers in weird places
)
I'm not sure what the "civs like more to start in the middle of the map" is for though. again, imho that can also be removed by setting what you thing is an ideal value and making it a constant instead of a variable. imho civs should start in the middle of the map only if there's too many of them to have them all start on the coast, aside from the malakim that love deserts which are NOT found on the coast of course
and there you go, way more feedback and whining than you could possibly care for