Greetings,

At the moment we do not have any plans of adding the option to "repair all" areas of your inventory to mender NPCs.

Also, in regards to the Disciples of the Hand repair system, the development team is concerned that even if they make adjustments to the system that it would not be used as much as mender NPCs; however, they would still like to make further adjustments. At the moment they are currently working on other elements that are higher in priority and the time period for this adjustment is undecided.