Hey, figured I would respond since I am pretty sure Sheable won't.
In regards to the update request, they have explicitly stated that they will not be updating the game again. Any improvements they wish to make will be done in the sequel, not here.
Also, there is no modding support for this game. Therefore, it is likely very difficult/impossible for the community to do it (Although I don't have experience with modding, so I could be wrong).
TL;DR - Sorry, your request most likely won't/can't be added to the game
For their new game, you can find the dev log here:
https://ci-en.dlsite.com/creator/16553
It is all in Japanese. I personally use google chrome since it has a good feature to translate all the text on the page since I only speak English.
I would recommend reading the 10ish dev logs Sheable has posted to see if you like what they are doing since they have changed the tolerance/rank system in the sequel.
If you would still like to make requests, you can then post them there since I don't think Sheable checks here often/ever.