Comment 5 for bug 403687

I just had the exact same idea and implemented it as a plugin, currently sitting in lp:~marienz/+junk/shelfstatus. It adds a single line "%d shelved changes" if there are any. I'm not sure it does the right thing for all switches (I tried to turn it off for modes where "bzr status" uses one filename per line). Still, this might be useful for someone, or as a starting point for implementing this in bzr itself.