I never mentioned not signing your licence application because it is irrelevant whether you sign it or not, your agreement to it has the worth of signing bus ticket, the issue and revocation of licences is purely statutory ,no one is required to agree in writing to follow the law.
When you apply for or renew your licence and you are asked to agree to the " licence terms and conditions" , verbally over the phone, tick a box on a form or any other way it is ultra vires, ( but not illegal ) irrelevant and just empty words with no legal standing, saying yes doesn't bind you to anything at all .
In my opinion.