Just a thought, logically speaking, shouldn't Vasari Phase Stabilizers be open for allied factions to make use of? For example;

Vasari Player A has Phase Stablizers between his border with TEC Ally Player B and his front lines.

Vasari Player A comes under attack from Advent Player C and is losing, so requests TEC Ally B to come and assist, rather than having to go possibly upwards of 7 jumps to get ships to support the Vasari Player, why wouldn't the stablizers be open for allies?

Unless this would create some balance issue that I'm failing to see, of course.