your opponent can ask for a new map, he cant not ask for a specific map (such as w2w)
if he does not like the w4w you can change it to a different w4w... if he does not like that, maybe you can change to a different w4w, and if he does not like that, he is clearly being difficult, and you can tell him either light up, or leave it to the mods...
bng, you can ask the player to show the map prior to lighting, i think its like right clicking, then left clicking then accepting it turning to .png file or something (in map creater section) i dunno exactly how its done off hand, but i just know how to do it.. and im sure everyone else is familiar with it...
its a good rule, stop trying to find flaws when there really are not...