Can you hook more than 4 taps to a jockey box dispensing kit? 

Jockey box (or jumper box) dispensing kits usually max out at 4 taps, because that's the most coils you can put in a 54 quart cooler. But does that mean CO2 tanks max out at 4 taps? The short answer is, no.
Additional dispensing kits, or gas lines, can be added to your tank with a primary regulator that has another main output (if you want more control over pressure), or even simply splitting the gas line again and attaching another manifold.
5 LB CO2 tanks dispense 5-6 full size kegs, so if you add more taps to your jockey box dispensing kit, you also might want to consider adding a larger CO2 tank.
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