[Stupid Poser trick #1]
If you use the figure mixer to create a hybrid figure in Daz|Studio 3 ADV, then save the figure as a CR2 and load it into Poser, INJ morphs don't work correctly (wrong vertex order). The easy way to fix this is to load the base OBJ for the first figure in the mix, then load the second (+ any additional) figure's base mesh as a morph target, dial in the same amounts that were used to mix, and then export the new OBJ. Finally, edit the CR2 to point to your new obj, and viola! INJ poses will work with a D|S mixed figure in Poser. Tried in Poser 6, haven't tried in Poser 7, don't know if it will work in Poser 8.

[Stupid Poser trick #2]
Just discovered a rather interesting new trick involving the grouping tool: if you spawn a new group on a body part, then save the figure to the library, then load the figure and add a bone for the new group in the setup room, both the new part and its parent will retain all morphs, although the morph dials will be hidden on the new part and its parent will control its morphs. This works in Poser 6, haven't yet tried it in Poser 7, don't have Poser 8 yet (obviously).

Would someone kindly bonk me over the head and then wake me up when Poser 8 is shipping :)