@PoP: Hmm, on my end, USBNet's busybox isn't in my $PATH
Code:
┌─(ROOT@kindle:pts/0)───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────(~)─┐
└─(0.29:37%:15:27:100%:#)── which busybox ──(Sun, Sep 25)─┘
/bin/busybox
And that's indeed the default BB

.
(Don't mind my poor K3 clock stuck on a random 2016 day

)
(And, yeah, that's on purpose NOT to screw with the system's reliance on its own potentially-mystically-patched BB version

).
----
Thinking back about the overlay/background thing, you're right: with overlay enabled, it explicitly states "no bg pixels are drawn", and those padding rectangles are definitely background, so, yeah, they shouldn't be drawn at all

. I'll fix that.