Speed up "Choose Symbol" by responsing to keyboard

Many list-boxes allow rapid search by pressing a sequence of letters. In Kicad 5 this is missing from "Choose Symbol" (and, perhaps other list/search dialogs?)

The existing dialog is a "tree". Suggest that pressing a sequence of letters navigates the current tree level. At startup, we see (by default)
4xxx
4xxx_IEEE
...
Triac_Thyristor

Typing 'R' (at this top tree level) should jump us to "Reference_Current", now typing 'F' should take us to "RF". Typing <ESC> should clear the "RF" search prefix. Thus, if I type <ESC>, and now type "D", I would be placed at the "Diode" node.

Next, I hit <ENTER> to expand the tree node (this already works). Now I should be able to type 'B','A','T' to get to "BAT41", which is close enough to "BAT46" that I now use the mouse.