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I still think that it would be so convenient to have a perspectivetool.
Vanishingpoints are often far outside the frame, so it would be great to have a tool that solves that problem.
I was thinking of a sort of web (see attached image) that serves as a grid (maybe it can be an option in the gridtool).
For a 3-point perspective, we would need three of those webs ( in different colors) that can be shown simultaneously.

I second the request. Very handy for hand drawn animation and layout.

well, in this vein, the smart Lemec's plugin "ProTractor" is (in its way) a helpful perspective tool when it goes to build a solid perspective environement.

I don't think so. It crashes regularly and all lines are curved, which is nice if you want to emulate a wide lens of some sort, but in normal situations I find it quite unusable.
This feature I was thinking of is extremely simple and easy to use.