Renaming files beyond counter start value 1000 does not work

[Jesusfreak]

I have a bunch of files which I want to rename starting with "1500.tif". Gwenrename has a restriction for the counter start value of "1000" which cripples functionality and is totally unnecessary.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: gwenrename 1.1~beta7-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Sat Nov 17 20:40:57 2012
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-08-13 (96 days ago)
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gwenrename
UpgradeStatus: Upgraded to quantal on 2012-10-19 (29 days ago)