3. Slightly highlight items that can be interacted with. Some things like scrolls and the like are SO small they are easy to miss. It's tedious to have to move the mouse around to try and find ALL the tiny things that you can interact with.
Pressing "left Alt" allways worked for me. O_o
If I remember correctly "left Alt" highlights imporatant items only. That's different then D:OS2 which highlighted every object. I prefer BG3 approach, as Larian games have a lot of systemic junk (evey cointainer interactable, most items moveable). My advice to the OP would be that if ALT doesn't highlight items, they are not important, unless you specifically want to use said items.
4. When a combat starts don't automatically skip group members who are stealth. Put them into Initiative order, and let the player decide whether to join them into combat or not.
This is actualy great idea! O_o
Yes, everyone without combat "bubble" should be included in the initiative, no matter if stealthed or not. The same should apply to summoned creates who can expire if you forget to immediately do something with them (and therefore have them join in fight).