Table nodes are jumping as we click instead of being dragged relatively

[ustk]

When we click on a node in a table, the node in question instantly jumps to mouse position.
It should wait to be dragged with relative mouse position instead of absolute.

It seems minor, but since the value shows after the jump, good luck to get back to the original value...
So it might be good as well to popup the value on hover

Also, it would be useful to get a fine setting with a key modifier (usually CMD but here it is taken by node delete)