And that's part of the problem. Most people I have discussed this with have the same opinion as EmperorPingu in the statement I quoted below.
We don't want to turn off Temporal Stability completely, we just don't want it affecting surface chunks because that restricts player freedom.
The game does not give any option to disable this portion without also disabling it in its' entirety.
I think the application of Temporal Stability affecting you underground is great, it's somewhat predictable and limits how much time a player can spend harvesting valuable ores and looting ruins, but can be counter-acted by killing rust monsters or by sacrificing a temporal gear.