I think it’s worth considering turning optional components into plugins as long as discovery and onboarding are done REAL well. The plugin directory is definitely a way, but i’ve seen companies do one-click installs from inside the settings screens of the plugins themselves.
Also another subject – how often do we (the collective we) feature prominent, large, special, or niche BuddyPress powered sites? If developers see potential that might get them more involved in testing, etc. Problem is how to discover or find them on a constant basis. This goes back to a mention of mine of “marketing” earlier.
