please explain further on your question. Are you talking about temporary fills? Permanent fills? Primary or permanent teeth?
I have no use for KRI paste, but it can be used as a temporary fill material between initial debridement and obturation of a root canal. However, CaOH is just as good and all I use in these cases. You still need to place some kind of temporary filling on top of the CaOH or KRI however.
IRM/ZOE is still pretty common for pulpotomies on primary teeth. That's about the only time I use that nowadays.