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I tip a few dollars for carryout but I believe it should be optional and not expected as some restaurant employees seem to. Every situation is different. Having worked in many of these positions I have a hard time justifying 10% on carryout while $2-3 for a delivered pizza is the norm. Somebody takes 30 min of drive time on their car, braves the elements and neighborhood and delivers to my door deserves more than somebody who hands me my bag of carryout. For carryout In many restaurants it is the bartender or hostess. Yes they do work and ensure your order is correct. Fact is, half the time my order isn't correct and often if the bartender is busy then a manager or other employee puts your order together and the bartender somehow is still the one who recieves my tip. Also, the argument that servers are paid sub minimum wage doesn't really apply here as bartenders, hostesses and everyone else is paid a higher rate and they are usually the ones putting your order together. Also, these underpaid bartenders are also tipped $1-$2 for each beer and glass of wine I order. If I get my drink from the server at the table than many places obligate the server to tip the bartender a percentage of sales. If you are working in a restaurant and complaining about not making sufficient carryout tips it really shouldn't make or break you unless you can't make any tips of walk in customers as well.
Again, I believe a few bucks is often appropriate amd even more under certain circumstances but advocating 10% is simply an employee feeling entitled.