As for enabling permanent use of runway stop bar lights, this document goes into (some of) the ramifications:
EUROPEAN ORGANISATION FOR THE SAFETY OF AIR NAVIGATION: September 2008: Runway Safety - Use of Stop Bars 24H
This study and consequent work was undertaken by the Local Runway Safety Team of Manchester Airport. Due to the successful outcome of the trial, the use of stop bars 24 hours per day to protect the runway will be continued as part of normal operations at Manchester Airport.
I recommend reading at least the Executive Summary. It might be useful as input for Haneda Airport.