Zone events?
Activation:
(method of calling) self setZone (up) (height in bricks) (0 0 0)
onZoneEnter player (variable stuff here true)
onZoneLeave player (variable false)
Deactivation:
(method of calling) self setZone (none)
By method of calling, I'm talking about if you use onActivate or a remote brick fires setZone on that brick.
If you make a giant 64x plate, it will make the zone the size of the plat and the height in bricks of your choosing.