Currently you can't lower an unrolled prayer mat to the ground. When you unroll it it's placed in the room and you can't pick it up. I'd like to see it unrolled into the at your feet slot or be able to pick it up so I can lower it there. IMO it makes more sense to unroll it there.

I suppose prayer mats needing to be rolled to be picked up could be a feature not a bug though - it prevents people from grabbing it by accident.

Having it unroll to the At Feet slot would be great though, as my Cleric has definitely lost a prayer mat by accidentally walking away from it. One of my favorite things about At Feet is the 'You have a [item] at your feet you shouldn't leave behind!' message.