i’m not going to add any scripts which allow me to “fix” mistakes. i know myself well enough that that’d be a slippery slope which i don’t want to go down. of course that is up to you, and you have to know yourself whether you’d use it only for honest typos, or would expand its use
statistics are again a personal thing, i like them, they help me keep track of where i’ve been, which i find useful
besides that, scripts provide a lot of extra functionality. for example Kumirei has a large collection here: Kumirei's Userscripts - #2 by RoseWagsBlue