@DRNKMNKY:
Great! I'll clear up the readme on the whole searchbar thing

.
As for showing the 'USB Drive Mode' screen straight away: that shouldn't happen. Did you happen to do this *while the Kindle was plugged to your computer*? If it was plugged in, that's likely the reason this happened. If it wasn't, it's likely a quirk of the K4 I'll have to look into (but it's gonna be tricky because I don't have a K4 ^^).
And, nope, it's the only 'vanilla' way to toggle it on this device. But you can, indeed, use a launcher like launchpad or kite, or even set up a Kindlet launcher.