Someone always says it, and probably already has done so in the thread, but...
Dear Bioware,
Make a game about a C-Sec detective dealing with multiple cases in the citadel that involve the numerous criminal organisations, the embasies and/or the council. If you want to throw some chaos into the mix add sovereigns attacks on the citadel, or some event involving batarian, geth or whatever, but keep it within the already established and known universe.
Gameplay? Give me Deus Ex/Prey (new one)/or why not? The cancelled Prey 2 gameplay. Heck, I'll go crazy, give a Detroit Become Human style of game if you want. Just not a miliatry shooter. I'm a cop, I don't have big guns, just my gun, my wits and (if needed) my fists.
Let me build my own C-Sec officer and chose his/her story. Let me choose many races (would love to see an Elcor, Hanar or Volus officer, but I'll settle with anything other than human) and backstories (a family person or a hard lonely type detective among others), make my little and big choices matter and have consecuences on the life of this peculiar detective. Move away from good or bad, give me a lot of grey.
Make it a conclusive story and leave some threads hanging for a sequel on Omega, for a fresh start.
I love the universe you've built, let us explore it on our own time and taste.
Thank you for reading this.
Sincerely
ME