Explorers could always suffer the risk as well, from monsters, falling rocks, injured eyes/ears/nose from frigid water, etc. And accidents always happen while doing a peaceful job, such as alchemy. Explosions or accidentally made toxic fumes might knock out some senses, but... For most other jobs, it probably won\'t happen on a regular basis. Assuming alchemy/explosions happen on a regular basis.
Perhaps a character should be able to suffer from only one \'complete\' sensory dysfunction. If another tries to cause an additional sense to malfunction, then that sense will only be dulled somewhat. For example, say a character is temporarily blind. Then another tries to take away his sense of feeling. That will only make it dull, not taken away completely. The character will still be able to feel some pain, but is unable to perform the more complicated maneuvers.
Echolocation could probably be implemented as a special racial ability. The type that bats use. It could be another alternative to moving around when blind/having a disrupted feeling. Deafness would disable this, obviously, which would make deafness something worse. As if the text not appearing on the chatbox was not bad enough, although I\'m not sure if echolocation should be an unique racial trait or anyone can use it. Or both, but the latter might need magic.