It would be very amusing to me if wizards would just go ahead and publish a table, like in the BoEF, but officially in the DMG, with marks for "compatible", "possible but rare" and "usually requires intervention (magic/divine etc.)", and of course with the usual caveats that this is just suggested and to tailor these details to your own world and game as desired etc.
OneManArmy claims he's a time traveller but I believe you are a true seer Niara
