Thing is, both Gyruss and Time Pilot should be played with a spinner. I think it would make the game much more playable.
I'm planning on building a spinner based cabinet and it'll have both Time Pilot and Gyruss on it.
Can you really make that work? Both of those games were programmed to accept 8-way stick input, I'm not sure whether MAME can translate spinner input into that kind of stick input in a useful way. I'm guessing it might require a pretty serious hack.
It's a neat idea, but I'm not optimistic about getting it to work in a satisfying way.
Question regarding Typhoon and Tempest 2k - those are 4:3 games only or can they be played on a vertical setup?
They are 4:3 horizontal games. T2K is an Atari Jaguar game of course, so it was designed strictly for a TV set.
Typhoon 2001 has some options to adjust the aspect ratio which "can prove useful if you play the game on an 16:9 TV or something like that", according to the website. I have some doubts about whether you can get it to actually rotate the display 90 degrees for a vertical monitor though. It's just not made for that.
I hadn't given it a thought myself, since I'm building a rotating-monitor cabinet anyhow.

ADDENDUM: I just realized Typhoon 2001 also requires a joystick to move you up and down, only for the bonus stages. Which is no problem. . . It's just a little peculiarity that it inherited from T2K, where everything was done with the thumb pad.