I use a lot of rounded mortises in creating woodwork items which are essentially slots cut into the wood. I'm not sure if there is a standard notation for slots but it would be good if there was a command similar to the Hole command which could automatically annotate slots (eg. Slot Width x Slot Diameter x Slot Depth maybe). Maybe even a Centre Mark command which could recognise the slots as a complete entity and automatically insert two perpendicular centrelines would definitely be handy.