The tab coloring is great, but sometimes you need another layer of protection. It would be fantastic if certain environments could be designated as "protected" or something like that, and if you execute a script that in environment that does anything other than a SELECT (INSERT, UPDATE, DELETE, TRUNCATE, ALTER, etc.), a good old-fashioned "You are running this in "<environment name>. Are you sure?" dialog pops up and you have to click YES in order to actually execute the script.