I'd appreciate a control preset for pre-0.10 controls. Muscle memory's a pain.
Once you setup your controls once, you can just copy over your settings.lua file across versions to not have to set your controls up again (assuming you're playing DRL on the standalone versions rather than through the JHC mod, where you would then not need to fuss about carrying your controls over across versions), while the legacy section in the keybindinds options allows you to set keybindings to old actions that aren't covered in the default like opening/closing doors. If you mean having the option of bringing back the old menuing system with the preset quickkeys and each menu spot having its own preset letter key, according to Kornel
that won't be feasible to implement.