wc3edit.net

I think that WC3 would see the /, think it's a B.Net command, and when it isn't, it will say it isn't a valid command, and to type /help for a list of commands.

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it doesn't work on battlenet. if it isn't battlenet they will see "/"
Just use observer, will you?

for map collisions, no, you can't add trigger or it will be desync. What ? you hosted and no desycn? Try it again on garena and battle net?
Adding a triggers will surely desync. The only chance you host it and it doesn't desync is when you change the filename and all other LAN players joine your game and download the map. (ie, it doesn't work)