SRB2 can change it's level design, it can change it's character design, it can change it's art design and style, but it will NOT change a single ability on Sonic, Tails or Knuckles. Sonic is already the fastest character in the game, and suggesting a Jump Thok is another means of nerfing Sonic's thok, which the whole game was designed around. Changing that will destroy most of the community in no time, and no one thinks it's a good idea; I don't even like the thok in every gametype that isn't co-op and I don't support this idea.
The Drop Dash is meaningless as there is already a thok that does the work much better, and much more fluently.
The special stage rings mod isn't exactly a good choice to takeover in the case that the mod itself isn't all that respectful to multiple token locations, which nullify any means of a second/third chance for players.
Your suggestions are entirely based on mods in releases, and for the most part, they seem to be based on mods I released as well. Let's not have another "This should be in 2.2" moment, eh?