Keystrokes / "+" no function / "Del" removes selected object instead of selected list item

[AlphaRay]

I miss some keys i know from online osm editor, e.g. "+" to add a new tag to selected object.
The second, the Del key have no function - when selecting a tag (red focus border!) - like "name - Street1" and press "Del" the whole street will be deleted and not the selected tag!

[Gubaer]

In r1945 DEL now deletes properties in the property dialog or removes the current selection from a relation.

I didn't implement the requested "+" shortcut yet. In my opinion, this is too potlatch specific.