In no particular order, these are minor non-gameplay improvements that I found would make my own play experience better:
1. All team ratings on team selection screen
In addition to the overall rating, show the granular team ratings (Attack, Defense, Lineout, Scrum, etc.). This will give players a better sense for each teams strengths and weaknesses.
2. Pre-match lineup and tactics management
After team selection but before the match, allow us to manage our starting lineup, substitutions, and tactics.
3. Sorting in lineup management
Scrolling the list is burdensome. I can never keep in mind just how many players per position I have in Career Mode. While I'd really love a more visual presentation of my roster, the most minimal change with the greatest impact would be to allow sorting by position.
4. Player overall rating on team comparison presentation
I absolutely love this addition. Bravo. I'd like it to have the player's overall rating, though, so that I can see the matchups better.
5. On-field stamina display
I have absolutely no idea how tired my players are on the field unless I pause the game and go to the Team Management screen. Please add a Stamina gauge HUD element for both your selected player and the AI's selected player (I'd also like to see the name of the AI's selected player).
Bonus: Mark the 10
Put a permanent visual element underneath the fly half (for both the player and AI) on the field to mark them out better. If my attack is going to run through the 10, I want to know where they are on the field at all times.