well, i've found yet another undocumented feature of the demo game map editor. of course, ALL of the features are undocumented, but, oh well :)

to put the same texture on the map over and over on different tiles, get into the texture adjusting mode (see above docs), click on a tile of the texture you want to copy to another tile, hold down the shift key and click on the new tile. it will turn to the texture you previously clicked on.

example: you want #4 textures all over your map. go into texture mode with the J key. click on any #4 texture (left click) or make one tile a #4 texture if none currently exist and then simply hold down the shift key and click on any other tile and it will turn to a #4 texture. simple. you can simply keep on clicking on other tiles while holding down the shift key and turn each of them into #4's also. fast.

K.