It's all about verisimilitude, friends, and TOS had it in spades.
So, in no particular order...
1. No use of communicators during normal shipboard situations. Use the intercom.
2. No sidearms carried or within reach during normal shipboard situations.
Next?
So, in no particular order...
1. No use of communicators during normal shipboard situations. Use the intercom.
2. No sidearms carried or within reach during normal shipboard situations.
Next?