new urxvt tab in current directory
remove periodical update of title

it is udated only when needed and 2 seconds after last press of enter key
custom title

Use the following in your ~/.Xdefaults to set custom title showing
current working directory and git branch in that directory:
URXvt.tabbed.custom-title: echo -n `pwd`; eval __git_ps1;
Since this time forward your PS1 is free again!
use Left/Right + Mod1 instead of + Control to move a tab