All that seems to be required is registering a dispenser behavior for each seed using ether Botania or Quark's BehaviourSeeds class when they are present.

Closed without any response... Is that a denial on the request?

If example code is needed Vazkii registers the vanilla seeds in Botania here SeedBehaviours.java and in Quark it is done here DispensersPlaceSeeds.java.