This is just the Debian version 0.11-1 of pqiv with a modified scroll-event handler, which by default now moves the image (in fullscreen mode) instead of switching to the next or previous image, respectively.
My patched pqiv-patched extends its original license:
pqiv - pretty quick image viewer Copyright (c) Phillip Berndt, 2007-2009 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License ONLY. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Minor modifications by Jens Oliver John <jens.o.john.at.gmail.dot.com>