This is a good idea especially for mobile users like me that having a hard time selecting all the text inside the code. But since this is just a one time procedure in every campaign that I join, I just developed a way to easily copy it.
When I was looking for a signature campaign I came across this problem.
I spent a good few minutes trying to copy the signature text correctly and couldn't (seriously), I gave up and waited to get access to a PC to copy it correctly.
I can't complain because I like the forum the way it is, this style of forum I am getting used to a long time ago and it is very easy to navigate, but the mobile part is really difficult, I don't even try to post on my phone anymore.
But even in a computer, the field code is weird, the CTRL + A command doesn't work inside the box.
This is something campaign managers can do by themselves. They often add all kinds of eye candy (images) to their thread, and an external link to a .txt file with the signature would be an easy addition.
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It's a simple and good idea
Despite the difficulties it is usually a very rare action to copy the signature, users do it only once when they join the campaign or when there is an update.
Let's summon some user here
@TryNinja, can you add a button to copy the content of a code field?