This is required to ask the user for their password, iirc.
I don't think so. Something like "sudo apt-get install -y lib1 lib2 lib3" is what I was thinking of, and that won't affect the password prompt.
We intentionally don't automatically force the installation. The user should always review the changes to make sure installation will not cause other problems. This happened for example, when Ubuntu had a bug that would remove the 64-bit versions of X11 packages when installing the 32-bit versions.
Nothing extracted yet.
See the title. This can be easily fixed by adding the -y flag to whatever apt-get command is used to install the libraries.