would be nice if we could print the model @ .1mm, then print supports @ .3mm
also would be nice if supports were narrower at the base, then would 'bloom' to meet the model - saving additional time and filament.
We'd need to add a Z hop to the tool path when the model and supports are uneven of course.
clumsy MS paint example:

http://i.imgur.com/s7CNlDL.png