Inspector: "jump to next sibling" command

[vemv]

When Inspecting e.g. a sequence of 100 items, I may be looking for "the interesting one".

First I have to focus in it (Return), and then, if it turns out not to be interesting, pop (l), go one item down, and repeat.

It would be more efficient to be able to visit the previous/next sibling with a single command.

NOTE: this would need to be implemented at Orchard level first.