OK. I'm not going to test this, but this should give you a general idea. First of all, find a 1 tile sized entity (there's one in the Dark Egypt model pack and I think one on fpsfree. Put the tile in the segment hole, then right click it and set immobile to yes. Make sure it is dynamic.
Add this script to it, and it should work:
;Artificial Intelligence Script
;Header
desc = Breaks Floor
;Triggers
:plrdistwithin=40:coloff,runfpi=destroy\crumble.fpi,sound=$0
;End of Script
Then, under the tiles sound place a wooden floor boards breaking sound. Change the tiles destroy script to crumble.fpi.
Once you've done this, place a trigger zone and change it's main script to plrwithinzoneactivateifused.fpi. In the ifused box enter the name "planks".
Then, find a wooden plank entity. Add 3 or 4 where the player will fall and make them dynamic. Change their names to "plank" (no quotation marks). Change "spawn at start" to 0.
That should do, let me know if it works.
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http://forum.thegamecreators.com/?m=forum_view&t=142774&b=21