1) Hardforks are inbuilt into DAG, kind of, depends on what you mean. See in Byteball, despite CfBs lies, and unlike Ethereum its possible to grow many "histories" many "chains" at the same time, on different nodes, and these will be part of the Main Chain - ordered according to when they are seen, and they will be included if they do not double-spend. Who decides this ordering and following of "do not double-spend"? Who "sees"? Witnesses! They only see transactions and post their own approvals, stamps.
5) There is no proof-of-work and no generation of coins, all are existing and generated in genesis unit, form which distributions take place every full moon.
Thank you, and sorry if I am not clear enough. English is not my first language.
Who can decide on major protocol change? Is it possible, for example, for owner of byteball.org website to make a wallet with 15 witnesses in code and force users to run new version? Will network catch it and run with 15 witnesses? Who and how vote for consensus in situations like with BU - SegWit?