Especially in the large stations, where pads are placed side by side, a four way might be problematic since it would intersect with nearby other pads. However I don't see a problem with stacking them several levels deep.
Also, why do outposts have turntables? Any direction to leave is fine. And why do they let you go down if there is not outfitting or shipyard? Would be cool to have just a concrete slab and nothing more to land on, no fancy moving parts, for the really cheap installations.
Elevators exist on small outposts to clear your ship from the (usually) single Medium landing pad while other pilots land so that your ship is able to remain in station and do business there. A pet-peeve is pilots who hog the pad and refuse to call for the elevator. Damn no-fire zones! I always figured the elevator was obviously for stacking hangars but then why would anyone design it in such a way as to not maximize storage capacity? One ship per level/elevator? Since there is a turntable and tracks, obviously multiple hangars per level is more efficient and stacking levels of hangars even more so. It is farther than you think, over to that landing pad next door and besides, who is to say the pads are not/cannot be staggered to accommodate the volumes or even angled/turned? It does not have to be all right-angles. Plus, you have noticed that the pad slides on rails so it could easily be shifted a few feet if hangars actually intersected. Also, since it is not reality and it does not matter if the hangars "actually" intersect (since we never see them from the outside) it would just be a very small fudging of the gaming mechanic to make it work. The game's entertainment value would be increased immensely. Player interaction would increase and I for one would enjoy feeling like the station is actually working around me and not just playing .wav clips of "working" clank-clunk noises.
In fact, I just had a thought: Why does a station need all those landing pads? On large stations I have never seen more than a small percentage of pads being used at any time. Why would even a large station need more than 3 or 4 landing pads
of each size if, (in large stations) instead of the elevator dropping a ship into its own personal, wasteful hangar volume, the elevator drops onto a linear track with hangars on both sides and simply slides down the track to the ship's "assigned" hangar. Now, when a landing pad is slid into its hangar a pilot could look out his canopy window and see the 3 or 4 ships across the tracks from him/her and possibly interact with the (if) human pilots, and a single landing pad could handle dozens of hangars! Doubled if stacked. Or possibly, since it is not actually reality, the ships could be dropped into a circular "ring" track with rows of hangars going AROUND the station (under the floor of the port). That would take care of the pilots that are commenting their ships are departing from different hangars/landing pads than the ones they landed at, as well as the "side-by-side" landing-pad problem. This way, when you call the elevator to be taken to or from the surface a pilot would get a little slide show of parked ships (labeled of course, with the CMDR names!) and empty hangars going by as they are transported to the surface pad or to their hangar. Different sized landing-pads and hangars could share a single "track" so a Sidewinder pilot could look out his canopy window at the Beluga or Anaconda sitting in the hangars across from them. The curve in the floor would have to be barely noticeable, too.