I am personally not too fond of the idea, not that its bad, but it kind of feels like somethings are being pushed a bit too far in regards to customization.
I am fine with some new features and what not, but I don't think it is that much of a good idea to add every feature (For as useful as it can be) cluttering up the code with not-so-much-deal-breaking configurations/options.
With the plugin system and any improvements it might have in the future, adding custom modifications is only going to be a matter of minutes, so everyone can freely mess up or overcomplicate their own installation without overcluttering the code with stuff that might not be really needed by most people.
Please note though, this particular change might not be too big to add (And my comment is not regarding this particular suggestion, but more of a common thing), but its just I've been seeing some "Make this a builtin feature" more and more often everyday...