I like the ideas, only I do not see how adding hash power could help with stopping a dump (someone selling too many coins on an exchange)
but I may be missing something.
Recently another coin suffered from a large dump by Crazyloaf and consequently the price remained half what it was before the dump.
I acquired a big chunk of that dump, so I felt happy to have bought cheap coins but also bad about the continuing low price.
So, I went into the exchange where this happened and strategically placed a buy order at the (still high) remaining sell price to get the
statistics back up to normal price, then I placed a few small buy offers at a much higher price than what was left over after the dump.
I noticed a few others also starting to act and moving their prices up, so in a few steps I placed newer and higher buy offers and got
a few others to follow, so the price ended up double what it was after the dump and stayed there. I did not use much BTC at all to do this,
so it is not required to be a whale to influence price strategically and bring it back to a sustainable level.
I feel that kind of price control might be needed after a dump to control the damage done by the price dump, so maybe you want to add that to the list.