"Advanced" features as options in base engine menu

Idea - Use the "base engines" tab to offer some selections that grey out menus if they are not relevant to a specific tune.
Say:
ETB (true/false)
Knock control (true/false)
Flex fuel (true/false)
Multimapping (true/false)

That way there is one menu to enable/disable extra options instead of it being down to lots of individual ones?

Start by locating the "base engines" tab and the existing individual menus for ETB, knock control, flex fuel, and multimapping. Review how current tune-specific options are enabled or disabled, then determine the intended central selections and verify that irrelevant menus are consistently greyed out.

Written by the indexing model from the issue text.