If I run aptitude as a non-root user, then press 'u' to update the
package lists, after prompting me for the root password, aptitude
updates the list.  If I choose a package to install, then press 'g'
twice, then enter the root password, I have to press 'g' again.  The
package should be installed without me having to press anything after
I enter the password.

This bug exists for 3 and a half years right now. Of course there are
many much important things to do in aptitude, but perhaps this one is
much simplier to fix. Would anybody do it?

I think that this one is really irritating for people who don't like to
start aptitude in superuser mode. If user decides what to install and
presses 'g', after passing root password he or she expects aptitude to
install that software, not wait for user to press 'g' again. I think
that most of users minimize aptitude's window after passing superuser
password, and when they rise it again, expects software to be installed.