Someone left a comment on the answer to this ending sentences with ように question saying that it only works with the -ます form.
I tried looking up （どうか）～ように。sentences and all the ones I found were in the -ます form, like this page http://jp.wordmind.com/ecmaster-cgi/Jsearch.cgi?kwd=%A4%DE%A4%B9%A4%E8%A4%A6%A4%CB, so is it true?
Are there exceptions? Are there other particles like this? Why is it the case if it's true?