Near my house there was one of Unreal Tournament. A long time ago I found this pic of Quake II Arcade edition. http://pc.watch.impress.co.jp/docs/article/980324/g_show03.jpg
Who say's it isn't? ...They only quote a ' RAM range' just like any hardware manufacture would do. ...It's up 'you the coder' how much RAM you need to run your software, not the hardware vendor.
So basically, the true RAM value is unknown? Anywho, if it ran on 512 or above, it shouldn't have too much lag.
even if its looks complicated to control, it's a good solution, cuz who wants keyboard and mouse on an arcade cabinet beautiful cabinets!