I hadn't thought of that... You are right in that I wouldn't have to go whole hog on using Profiles, just set up a Profile to link to a Role where I needed it. I think I will give that a shot with the Accounting role and see how it works...
EDIT: It worked very well. In fact, the Functional Profile wizard asks about stamps specifically, so it is apparent that Profiles are the way to go in this case. I am still not sure why that is, but assume it has something to do with stamps being set up at the organizational level and being an important part of workflows.