ALT VK_LEFT = ID_NAV_BACK
Is the normal K-Meleon combination. If I remember correctly it has been on that accel since longer than Phoenix aka Firefox existed
You can redefine it in user defined accel.cfg.
The editor is via Edit > Configuration >
Cave: the url bar + search button can also function as input for search strings.
I would personaly want to use backspace to erase
BTW. K-Meleon can use mouse gestures - is not that faster than keyboard input?
Mouse gestures like Firefox can be defined via Tools > Mouse Shortcuts or something.