Paranoia Rules. I fill it in for all my days off as soon as I get my roster. Only recently, when off base, scheduling called to ask if I could operate (ex-DXB) that day, but then realised I was off base...proving that the system works and protects your off days from no-notice roster changes..If it suits me I will indicate that I'm willing to operate, as it would give me a great bargaining chip for roster modification, callout pay, free trip back to DXB, etc. My licence/medical lives with my passport, so it's usually with me, as is my ID card (required to be carried on staff travel, don't you know).
It's a very small beer issue, that works to your advantage.