Hello, yeah im annoying with requests :D

I like the Rect from center tool, its very cool but it lack something.
You should have two snap points, the corner + the edge close to it.
For example draw a circle that's not align on any grid, then try to draw the bounding box... yeah its impossible !
You can do it with a mix of tools (lines) of course but its not very fast.

A cool thing would be:
1. Choose the center point, click
2. Choose the corner point and snap it to something, click
3. 4 points appears, each one on the middle of one of the 4 edges
4. Move these points with your mouse and the Rect is redrawing
5. Snap any of these points on anything you want

Or you can just have a checkbox to check between the step 1 and 2 to enable further control.

This can apply to the Box from center too !

(Im so fast at making that watch, thanks MoI :D)