Maybe a command like "nim faster" which would just give a short synopsis of d:release and d:danger. It has been my experience that people do poke at command line options with "\--help and friends" even when they don't read the man pages or properly search for results on google/manual/stackoverflow.
If adopted, it should also be encouraged to add it to turorials: "Remember: to make your program run more quickly do 'nim faster'" \- that's something that people are much more likely to notice and remember than the extensive list of specific relevant options.
