A new masking can has been added. You can use it to mask parts of the wall from being painted on. The mask can be inverted and cleared. It's a simple but very powerful tool and it's worth investing some time to get to grips with it.
Early Rift support has also been added and ViveSpray is now perfectly playable on Rift, however there will probably be further updates to make it more comfortable. Until then I recommend avoiding teleportation with the hand you're holding something in as it will be dropped. Instead just use your off-hand.