Zygon,
 
There are a number of cameras on the DLS based on "Dummy" locos etc. which you can place and switch to to get a fixed view.  They can be a bit hard to find, post again if you need the KUIDS.
 
I think that being able to "Fix" and hold/return to a free roaming view would be a good idea. 
 
Cheers
 
Chris