If you wish to apply for approval of any agreement not currently permitted, you should send it either typed on A4 paper to the Secretary to the Laws and Ethics Committee, EBU, Broadfields, Bicester Road, Aylesbury HP19 8AZ or by email. You should include a logical defence to any agreement and indicate how it is to be shown on the convention card.
The committee tend to look more favourably on applications that are not especially difficult to defend against.
There is also an appendix giving more details of what is permitted at each level.
For those who need a complete reference work the Orange Book is still available. The new Tangerine Book runs to just 14 pages with the appendix being 10 pages. It is available in electronic form from the EBU website in the Laws and Ethics section.