Re-installing Steam Version of game question?

[Blitzen]

I have a glitch in 'Plane Settings" utility& I believe that a fresh install of Steam version is required.I know how to uninstall game  and save missions & skins, but should I be saving anything else ...key settings perhaps ( where are they found?) Will frsh install be automatic after Steam is 'turned on?" I'd like to avoid any unpleasant surprises...  Thanks!