Comment 5 for bug 538487

While SHIFT is normally used for grid snapping, I would like to suggest the following implementation for changing handles:
- CTRL to snap angle
- ALT to lock length
- CTRL+ALT rotate both handles
- SHIRT (un)snap to grid
When handles by default snap to grid, the SHIFT should temporarily disable snapping to grid and vice versa. Some users would prefer default snapping of handles, others not. I do not have a preference but will need an easy way to switch between the two modes.

I would also suggest that the grid definition should offer "snap handles to grid" as an extra option with a sane default value.

Implementing it in this way will cater to all, be backwards compatible and in a way follow conventions within Inkscape.