At the risk of introducing another alternative, why not combine both and have two-way sync? If you move in DR, it updates in TDM. If you move in TDM, it updates in DR. If you want to be in two different places, you turn off the sync.
I agree, but due to the above I see this as 2 toggle buttons: Sync Camera and Sync Entities. Both of these toggle the continuous updates, no instant update buttons.
In my use of the reloadMap command so far, there are some things hot reload (at least currently) doesn't deal with, that restarting the map does. So, this gives us 1 more toggle bu