I too want to know about this. There are times in which I want the model to be preserved, as-is, not changed in any way. After peeking in the model for information only, the drawing requires saving the part!? I tried closing the part to avoid this. The drawing still MUSTsave the part in order to save the drawing work. What is going on? My other CAD allows save drawing without part save.
I have a macro to save only files with write access and ignore files with read-only. Couple this with setting SW to open referenced docs as read-only and you will greatly reduce save time.
Macro attached to this post. Also attached: icon for use with customizing macro tool bar.