Funny, I just made myself a JSGME mini-mod to fix this very issue today. Don't know if it works yet. Haven't tested it. Will report on my luck and provide the solution/download.
As for your troubles with the free protractor. Yes, those tools do not work if some sliding opject is in the way. But you can place line/protractors roughly and with long enough legs, then position the free protractor on the desired point and then re-orient the legs of the line/protractor in the propper direction. But it is cumber some, I know.
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