Nothing wrong with seven feet of 3/16". The flow will be slower. Before you even concern yourself with the length of line the PSIG to the keg must be dialed in. This is based on the CO2 Volumes, temperature and elevation of the beer.
For example, the Amber Bock has a carbonation level around 2.55 v/v. At 38F and between 1' to 1000' elevation you will require 14 PSIG. For a gallon a minute flow rate, install four feet of 3/16". For a slower flow, install a longer length.
The challenge has always been to be certain that you can manage the temperature 24/7 from the keg to the faucet. Never dispense from a keg until the beer has acclimated to your kegerator. Always use a calibrated thermometer.
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