Personally, I'd rather see shift+# trigger macros. As a macro you could make shift+1 post "Address 1" if that is a key combination you frequently use. Subsequent digits would be echoed on the command line without getting into strange behaviours like waiting to post "Address ###" until all the shift key is released.
For me, the address key doesn't see much use once patching is done and shift+# would be more valuable for other purposes.
