We are working on it...the issue is, we could do it with a YouControl menu, just like the statics in KIAH, but we must upgrade the software to handle turning on/off multiple objects with a single menu item, otherwise you would have to turn them off each one individually.
For the time being, use the Scenery Complexity slider. That's what a Scenery Complexity slider is meant for anyway...
Note that, if you reinstall now (either the scenery or the Stand-Alone Addon Manager), the installer will get the latest online Addon Manager files, and they now set the C17 to appear ONLY at the "Extremely Dense" setting so, turning the slider one notch down should hardly make a difference visually, but will get rid of the C17s.