I dont think any sensible shinobi would run around indoors in such high velocities. But then I'd say if capping the speed in certain buildings like indoor arenas, halls, dojos,etc. is put up, the players who would be incorporating speed as an important strategy in their gameplay during duels and battles, would be at great disadvantage.
Since speed is going to be a trainable skill, I suggest a fixed percentage of their max speed should be used as their individual indoor speed limit. Probably even the speed limit can vary with the varying sizes of the room. (like snoopy suggested)
For eg. In a dining Hall, the limit is 40%
while in a meeting room, limit is 15%,
Suppose you have trained your speed to 80kmph,
then in that hall, you'd be able to run at 32kmph max.
while in the room, it would be 12kmph.
About the shoulder camera while indoor.. I'd say the zooming control is good enough, so when you're in compact areas, just scroll up and you'd be able to see your character and her/his surroundings.
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