This script allows you the change the destination and name of your screenshots right after hitting printscreen. Bind your printscreen key to this script.

zshot.sh

#!/bin/bash

# zshot allows you to easily change the filename and destination of each screenshot
# Dependencies: scrot, zenity

cd ~
if [ ! -d "Pictures" ]
then mkdir ~/Pictures
fi

if [ "$1" == "--rename" ]
then
    OLDFILE=$2
    NEWFILE=`zenity --file-selection --title "Name the screenshot" --filename "$2" --save --confirm-overwrite --file-filter='*.png'`
    case $? in
        0)
            echo "\"$NEWFILE\" selected."
	    if [ "$NEWFILE" == "" ]; then
		rm ~/Pictures/$OLDFILE
		exit
	    fi
	    mv ~/Pictures/$OLDFILE $NEWFILE;;
        1)
            echo "No file selected.";
	    rm ~/Pictures/$OLDFILE;;
        -1)
            echo "An unexpected error has occurred.";
	    rm ~/Pictures/$OLDFILE;;
    esac
    exit
fi

if [ "$1" == "--selection" ]
then
    scrot -s '%Y-%m-%d-%s.png' -e 'sleep 2 & mv $f ~/Pictures/ & zshot.sh --rename $f'
else
    scrot -d 0 '%Y-%m-%d-%s.png' -e 'sleep 2 & mv $f ~/Pictures/ & zshot.sh --rename $f'
fi

excellent.