A slight problem with the runway is that any taxiway (assuming there would be one) would have to go on the side away from the airport, which is undesirable from an operational perspective. Perhaps a new runway could be constructed parallel to 25/07 with the existing runway turned into the taxiway.
IF and its a big IF 25/07 were to be extended then its my guess that there would not be a taxiway as all an aircraft would simply backtrack as they do at the minute. I also suspect that for optimal operational effeciency ( and lowest cost) both runways should be extended. The current runway for take off (and landing of heavy jets) with 25/07 used for single aisle jets in cross winds. A thousand feet onto both should do the trick, I suspect.