I build dioramas only, not displays, so it depends on whether or not the scene calls for a pilot. Sometimes it’s not a pilot, but a ground crewman in the cockpit, like a crewchief doing an engine run-up, or the armorers doing their thing to harmonize the guns. In my Monogram 1/48 Kingfisher WIP, the pilot’s in the cockpit, but the radio op is out on the wing trying to hook a raft with a wounded pilot aboard. In that particular aircraft, the cockpit is especially “roomy”, so the addition of a pilot doesn’t hide my detail work.

The difficult part of adding pilots to cockpits, for me anyway, is getting them to sit “right” and be convincingly strapped in. In the Kingfisher, the pilot’s seat-pack parachute doesn’t allow for him to have any “weight”, so I ground out the seat pan and that allowed him to “sink” in better.
The next step will be to attach the shoulder harness to the bulkhead and pull the straps over his shoulders and down into his lap. I’m gonna blow off doing the lap belt, it wouldn’t be seen at all in this pose, but the shoulder harness is pretty obvious.
At any rate, if you put a guy in the 'pit, you have to make sure that he looks like he won’t fall out, and a lot of folks that DO use a pilot overlook this step… 'Course, it depends on the harness type and aircraft as well, where the attatchment points are in relation to the pilot’s shoulders and if they would be visible or even installed (case in point, the swiveling “office” chairs in the nose of a B-17. The bombardier and navigator’s seats don’t have a shoulder harness, just the lap belt)… Were I judging at a competition, I’d ding the builder on this step if he opted to use the pilot but didn’t show how he was restrained in the cockpit, so I figure that any other judge would as well… I consider it to be the same attention to detail as showing packs, boxes, and duffle bags, etc, attached to and on an armored vehicle. You have to show how that stuff is kept on it…

As for you guys that say you “aren’t any good at figure pinting”, I say, “phooey”. If you can paint those amazing 'pits, you can handle a 1/48th figure… They don’t require as much of the “art” as a 1/32-35 and bigger figure does…
BTW, any of you guys that don’t use 'em, I’ll take 'em off yer hands, lol… My parts box “head-shed” is getting a bit sparse…