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That's a VERY GOOD IDEA, OP!
But I believe casinos with sports-betting services will NEVER implement automated cashouts for in-play betting, although there might already bots built for it, especially for arbitrage betting. BUT you could get banned for using them because you will get a higher than the average amount of edge than the casino. Read their terms and conditions.
I share your opinion on this. While it is good feature for the customer,it is not so good for the casino. That feature could decline casino's profit so that is why I think there is not big chance that tery will implement feature like this.
As for using bots, I doubt any casino allows that, but sonce I never used any kind of bot I never interested myself if they ban in case of bot detection.