I thought that I had posted a code snippet that would add a Redraw All DCs menu item.
I’ll have to do a forum search and see if I can find it.
EDIT (a few mins later and a quick search in this category): I think this is it …
I think the incremental size is controlled by rounding one of the dynamic attributes. See:
https://help.sketchup.com/en/sketchup/creating-dynamic-component-snaps-specific-size