Imagine I'm Samsaran inquisitor with mystic past life that nabs expeditious construction from the druid list (first level spell) and I have cast it.
Can I use that wall as ally for the purpose of solo tactics (ie treat as if it has teamwork feats !! if I have the press against the wall feat (meeting prereqs and feat tax, etc)...?
Benefit: If you are the only character threatening an opponent, you can treat solid, immovable objects that occupy a square (such as columns, tree trunks, and walls) and are adjacent to that opponent as allies threatening the opponent when determining whether you flank the foe.
Great for rogues, not so much for inquisitors. You could of course take a spell to summon something instead to use solo tactics.