Thank you for the quick and detailed response!
I'll describe the first option in a bit more detail. It's more of an aesthetic improvement than a functional one. When placing an inserter, its two "legs" initially point toward where the item will be picked up. However, with the mod, we can change the item flow direction however we like, but those two legs still stay pointed in the original direction. So, aesthetically, I’d like the two legs to rotate in the direction we've set for item pickup in the mod. :) Sorry for my English!
For the second point, you're absolutely right—extra actions would indeed worsen the experience in a regular game. However, in multiplayer, my friends and I often wish we could have complete control over placing the next 4-5 inserters through the mod. Alternatively, it could be set up so that when clicking on an inserter, an additional window with its movement direction settings appears alongside the main menu. This could likely be implemented as a toggleable option in the mod settings for those who need it.
Thanks for the clarification on the third point. Overall, it's not critical; this functionality would only be needed for very specialized purposes.