the other roms you can't but but I have a genesis legal rom pack on my site http://jbrodack.googlepages.com/genesis.zip that includes both zero tolerance and the unreleased sequel.
(Mode7 games like pirate wings, super mario kart and F-zero don't count I guess)
If you are counting Doom/Marathon/Wolf3D then you can count the above games since they all use the same technology (raycasting) to produce a 3D effect. Since that is the case then you may as well add Outrun to the list since that was one of the first to start off the psudeo-3D (2.5D engines) technology.