For me personally, I don't want to micromanage things if it's not really impact the game...
Like I already said, I search for management feeling and challenges.
For example, if staff training really impact performance and guests happiness, it could be interesting. It seems to be there, but does it really impact guest happiness? Because in previous RCT, I find the game too easy. The guests can complain about toilets for months without never really be angry about that. It's true about many things. That's why difficulty levels could be great. At expert difficulty level, the guests react faster to this kind of things.
Another example in previous game, you hire someone, you train him to the latest level and pay them well and bang, he's always happy... forever. He's never bored, he's always at work, etc. It doesn't seem like it's real people working.
Kind of random events could be fun... just an example: one staff member could ask for vacations (you decide if you let him take it or not and sometimes, he could continue to be happy so you're lucky, but sometimes not)... just an example. Mechanics goes to a ride and asking: I'm not sure about safety of this part: to be sure, I can change it for 1000$, do you want me to change it? (if you change it, everything stays the same, if you decide to not change it, it's possible if you're lucky that it will not have impact, but it's possible to not be the case ;-)
I would like to feel that the decisions I take really impact the game.
Also, I would like to manage stocks for stalls as I personally think it adds to immersion of management feeling. If someone don't like it, turn on auto-stock management.
Another example, admin buildings could be interesting but only if it really impact the guests (if we have to really hide the buildings). Janitors could bring the garbage to this building, but I don't search to micromanage the number of bags he can carry in the cart. I don't think it would really add fun to micromanage at this point of details. But having to train him so he's more efficient... yeah if we really see impact in the game.
It's this kind of things I mostly hope in the game.