I'm starting to play a little bit more with toshu randori and want to introduce a little bit more punch/kick play with the more advanced students. Main reason is that I have a pair of yudansha in PK arts and a) want to milk their knowledge and b) want to keep them happy.
If Shiai is your goal your randori needs to keep the strict rules in mind but more often than not we play. Sometimes there is such a beautiful opening that just begs for a non-Shiai technique. If you start adding these elements the full-blown randori is pretty much out of the question - but we do have less intense variations where they can fit in just fine.