I always pre-fill the filter, it does help with the dry startup. I just make sure I fill the new filter with new oil, before I get under the car to drain the sump. By the time I'm ready to spin the new filter on, the media has soaked up most of the oil, and unless I was sloppy in spilling oil around the filter flange, it will not spill out even when the filter is mounted horizontally.
The only vehicle I do not pre-fill is my kid's Probe 4cyl, as the filter is mounted with the can upright.
Nah, I just lube it up a bit to ensure a good seal and that the filter element is atleast somewhat saturated. Only time I tried to pre-fill a filter it got everywhere and pissed me off so I was like "F diz, no mo!"