(using Mavericks 10.9.2 (latest))
Using an application in Full-screen (eg VirtualBox), is there a way not to have the Dock show when the mouse hits the bottom of the screen?
defaults write com.apple.dock autohide-delay -float 3
to increase the delay (3 seconds) the mouse has to stay at the bottom to get the Dock unhide. But it's been confirmed to have no effect in Mavericks (10.9.1, 10.9.2) when in full-screen.
(No option in VirtualBox either, this is a problem in any (most?) full-screen app anyway).