A two-switch light might fit the bill. Tailcap switch for on/off, and side-switch to select modes. Most have reverse-clicky tailswitches, though, so it’s not momentary on (need a forward-clicky).
To me, though, a “tactical” light is 1-mode, full-tilt, and momentary-on so you can do a flash’n’dash silently.
I’ve heard of some lights that have a twistable collar for brightness control, but don’t recall which. And the DV-S9 diving-light has a magnetic slider just like a wall-mounted dimmer-switch. It’s one of my faves, in fact. The slider is the on/off.