There really isn't, but the frustrating thing is 1) to put something in the hotbar requires having it, or 2) setting the filter in the selection GUI. This gets tedious, and in the case of people using full hotbars, means clearing a filter first. Along the same lines, one can use pipette on a ghost or entity - but to make that in the first place requires... having a ghost in your cursor, or the item.
This mod is a small quality of life improvement: you don't need the item or to set a filter to get a ghost in the cursor. One can use the recipe, and by coincidence, other gui buttons of items or recipes. A secondary feature is pipette also works on tiles in the world (which pipette normally doesn't support at all).
In 1.2, both of these behaviors will be integrated into vanilla, but until then, this mod exists.
