http://github.com/dbb/urxvt-stuff
This repo contains some urxvt-related resources.
This patch changes the tab bar to look like this:
In other words, it replaces [NEW] with + and starts the numbering at 0 rather than 1.
To use it:
git clone git@github.com:dbb/urxvt-stuff.git
<tabbed.patch sudo patch -d /usr/lib/urxvt/perl
You need root permissions to patch the file /usr/lib/urxvt/perl/tabbed. If the tabbed file is somewhere else, like /usr/local, just edit the patch command accordingly..