Comment 4 for bug 921529

> this could be solved by simply adding toggle buttons for the gradient and pattern editors

What about the path effect handles? The existing toggle (to edit effect parameter paths) does not include knots e.g. used by the new Powerstroke path effect, or by the "Hatches (rough)" and "Knot" LPE - those are always present in the node tool context.

Maybe there could be a generic toggle in the node tool? e.g.:
- off (default): path nodes on top
- on: special nodes on top