Designers have toyed around with both of these ideas to some extent and by and large the games that implement them have been unsuccessful. Spectrum has no outlanes, Goin' Nuts has no outlanes and is timed and Bally's Beat the Clock (a very fun game actually) and Safecracker are both timed. There might be others that I can't think of or don't know of. The games I mentioned production runs ranged from never getting past a prototype to 1,000 units or so, so never a concept that really caught on with operators or the public.

Gotta put a tilt on the center ramp of any shoot the center ramp all day games like Police Force! Lots of fun. I think they did that as a side tournament in Portland a few years ago.