You can actually do some of these right now.
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Using
the "CAM_" console commands, you got the tools to take other angles of a focused character, you just gotta remember to manually reset them after use, as some of these save. Hell take my attached script, it'll reset all camera console commands for all 4 viewpoints to the game's default. With it at the root of your Ring Racers folder, just put "exec cam_clear.txt" in the console.
It may not be the full range of what you're asking for, and its not as easy as holding inputs on a controller, but it should come in handy for replay and character showcase stuff. Don't forget you can hide the HUD with "showhud off" too!