1. There isn't a max size but you have to breed for bigger and bigger sizes. I think there might be a minimum size but cant say for sure.
3. Its the bubbles icon on their stats when you control them not sure if there's another way
7. Yea they're a little odd to use but you can hold them into place by using controls for it (sorry forget what they are)
9. Purely decorative as of now.
10. You can have a kobold made specifically for holding large amounts of items and one that you use normally. Just use the machine you can get by following the quests.
Thanks, I tested
1. There is indeed no maximum value, but it will "decrease", and it will become negligible after a certain size.
2. The camera system can really help lock items.
3. There is indeed no method of "inheritance of the subject of investigation", you can only look at your own.
4. There are a lot of unreasonable problems in the game, stuck pillars, vacant terrain and setting problems. I don’t know if the author will update it.