We have practiced it at the Hawaii Betsuin as well, although I cant say it we have done it too often. Having said that, it is certainly a mainstream Tendai practice.
"There are no seperate dharma's in the Three Realms. There is only the operation of the one mind."
"Whoever wishes to benefit beings ought to establish teachings that fit their capacities, expound the dharma in accordance with their capacities, and match the doctrines to them"