I was tryaging some old bugs I submitted to debian, and I found one that bothers me till now: Shift+Pg didn’t worked on gnome-terminal with screen. It did worked with xterm, and this is why I thought it was a bug, and not a feature suggestion.
I just closed the bug after reading a suggestion from the screen maintainer, to add this code from /etc/screenrc in .screerc:
# To get screen to add lines to xterm's scrollback buffer, uncomment the # following termcapinfo line which tells xterm to use the normal screen buffer # (which has scrollback), not the alternate screen buffer. # termcapinfo xterm|xterms|xs|rxvt ti@:te@