A related request:
Vector Networks Like Figma Has
http://illustrator.uservoice.com/forums/333657/suggestions/43085403

Disclosure: This seems like it would be difficult to make happen, but it would be super useful for more complex perspectives & for more adaptability in the design process.

It would be great if we could select two or more points on some shapes and "link" them together, so that if one gets moved a few pixels to the right, the other one(s) also move a few pixels to the right. This should function as a toggle, so they stay linked even after going to select other objects or points. That way, you can keep certain things aligned for as long as necessary until removing the link. Ideally this would work not just on points of a single shape, but across shapes.

For me, I'd love to use this to make more dynamic/complex perspectives. (Yes, I'm aware there's a perspective grid tool, but it's honestly a bit too finnicky to use in my workflow). A feature like this would let users make their own perspective grids and link the end point of multiple lines together to act as one of the "vanishing points". If you linked more points together, you could also make those adjustments modify the shapes you've already built, in theory.

I could also see it being useful for logo design by ensuring that the width of letters or shapes remain a certain distance apart. That way, it'd be faster for designers to iterate with clients' feedback even while switching between multiple projects.

It would be so good to have a way to connect an arrow/line to a shape to create graphs and mind map, so when I move the shape the arrow follow me and remodel itself, as omnigraffle or similar

I was thinking about my own feature request about more general tool, and this is just a perfect foundation for it :)

great yes, please!!

This would allow you to join the end of a path to anywhere along another path, rather than only being able to join paths end to end. Or this could be made a secondary function of the Join Path tool.