Just an idea, but I thought it might be more interesting if there was more variety with sounds and / or animations when repairing keeps,
For example, if you are on a keep wall, then the floor surface is wood planks, so maybe some sawing sounds or the knocking sound you get when you use a woodworking crafting table
When repairing stone surfaces such as the floors, it would trigger the pickaxe sound when harvesting blacksmithing ore
I think it could be a little more interesting than it currently is, and the sound effects are already present.
Currently all we get is a crunching sound, so a little more variety would be interesting
I worked on the Skywind mod as a sound designer / audio engineer, and its amazing just how much something so small can make such a big difference