Tips and Gratuities

What do you do about tipping during the wedding. I will have a DJ, photographer, videographer, shuttle driver, lighting person and wait staff and day of coordinator (provided by the caterer). At least four of my vendors working the wedding are also the owners of their business. My understanding is, it is not considered proper etiquette to tip the owner of a business. Instead, the tip should go to the employees. IS this still the case? What have you done in that situation? For those that do get a tip/gratuity is it given in cash or included in the final payment of services? My concern is having all that cash on hand and trying to dole it out at the end of the night.