1. Can I put additional terms on top of AGPL? 2. What terms should I use for the self-hosted category? I wish to provide the license for 1 year.
1. A license is as good as someone's willingness to lawyer up and enforce it. With software, that enforcement is likely to require action in distant jurisdictions, e.g. international legal actions.
2. A reluctance to lawyer up when creating a license may correlate with a reluctance to lawyer up to enforce it.
3. Restrictive licensing is likely to create a marketing disadvantage. Custom licensing even more so.
4. Whatever licensing terms are applied must be compatible with the licenses of any software used to create the application...i.e. a time limited AGPL license might violate the license of components licensed under GPL. Again talk with a lawyer.
Good luck.