How you use you saw is entirely up to you, however my recommendation would be to avoid dado blades at all costs. To use a dado blade the riving knife needs to be removed (a riving knife on a dado blade will be of effect), which for me is just insanity. @Stu93 suggests making multiple passes through a saw which is a far better method. My preference is a router, it may take a little longer, but there is more chance of keeping all of your fingers attached.
In commercial use there are strict guidelines on dado cutting. Page 4 here gives the best advice. https://www.hse.gov.uk/pubns/wis16.pdf
