when a document is opened in a read only mode it is supposed that nothing can be 
modified in it. there are a couple issues with this assumption :

1. it is possible to insert data in that document by choosing insert->object-
>formula. it is not possible afterwards to remove this data either by deleting 
or by undo (oo.org informs that document is open in read-only mode).
2. for some reason insert->chart is not shaded and oo.org allows a user to go 
all way through chart creation dialogs - when "create" is pressed... nothing 
happens. insert->chart should be shaded.

maybe insert->names subitems shouls be shaded & unavailable as well, but as i 
don't use them yet, i have no idea :)