aop - How to easily remove Rails engines? -

my hope was, engines enable me add or remove features in app. however, whenever see how engines used, noone talks disabling/uninstalling/unmounting them cleanly. how can this?

the case product line of apps pretty similar. start developing variant features , work backwards disabling features other variants of app.

i work bit aspects in aop, can declare dependencies (in both directions), when want remove aspect/engine, code connected engine removed/disabled. whenever try rails engines, there has lot of entangled, customized code (e.g. when using parts of engine in views).