This week our inquisitor was looking to get this enhancement added to his loving glaive.
Collapsing: As a swift action a collapsing weapon can be shrunk to lose its reach property so that it may be used against adjacent foes. This weapon property can only be applied to a reach weapon that does not normally allow attacks against adjacent foes. It remains shrunk until another swift action is used to lengthen the weapon again.
Moderate transmutation; CL 7th; Craft Magical Arms and Armor, shrink item; Price +2,000 gp
If you have seen a similar property somewhere please let me know.