I work on files where customer changes frequently require me to change the size on a large number of identical boxes/frames (or weight on a large number of rules). I Quark I do this with an extention from Extensis (QX-Tools FindChange). Is there any way to do this in InDesign?
You can get part way there, certainly, for changing sizes by using the Transform Again commands, but you might want to look into a script.
For things like rule weights or colors (pretty much anythign except dimensions) Object Styles are your friends. Edit the style, and everything to which it is assigned will update.