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Only dealing with small blocks Ive never had to shim anything, but then again why do they make shims if there is no real world use for them?
This is sorta like the lash cap issue it seems, some use them some dont...some say there is never a need but they still make them.
But isnt a lash cap also a shim of a sort?
Its pretty simple to know how and where your rocker tip needs to be on the valve so I say do what you got to do it make things correct. 
yes, a lash cap effectively lengthens the valve stem, so does sunken valves, or running longer valves. if these instances occur, you may need to shim up the rocker arm shaft to correct the valvtrain geometry's relationship between the shaft and the end of the rocker to minimize side loading on the guide (which will cause excessive guide wear and valve stem wear).
if your problem is too much preload, you need shorter pushrods.
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