Hi @tc5440
Do you have a power user subscription? I don’t have access to a computer at the moment to check, but I’m sure with a bit of JavaScript you should be able to enable this on your account without any changes needed from our end
[Edit]
I’ve just found this topic which outlines what I said above, and how to put it into practice:
http://community.quickfile.co.uk/t/cc-invoices-sent-message-etc-set-as-default/5801/10?u=qfsupport