You really find the rectangle rule on your own when you learn to test your map on your local server. So, yes, use the server, test your maps manually.
One more thing, just because I like playing good maps and we god a lot of crap submitted and accepted in s3: Read Corrosive's manual on trivial scripting. Finish it. Add those features as you see fit. You can always ask help on the modding channel. We help with scripting too.
Just got tired to see good maps with everything hardcoded and non-statted. Or events that have to happen, but never happen. Especially on the new encounters with these copypasted locations. Those maps become boring very quickly.