Idea I had for an Mass Effect mods for a while now

[Zackeres]

So, I have had this idea for a mod for Mass Effect 1 for a few years now. (small spoilers for the game). After you do the misson where you can save only one, Ashley or Kaidan (I forget the name of the mission) and you try to romance both Ashley/Kaidan and Liara (if you saved them), they will confront you about who you want. If you try to date both of them, the game won't let you and give you Liara. What I am wondering is if someone can make a mode where you can date them both. Bare minimum I am thinking here, can date both of them, (in a polyamorous way) and get both of their pictures in Mass Effect 2. Larger scale I'm thinking here, that to get the option to have both of them on the same mission and then you get a new side quest which then allows the option to romance them both, and also a new sex scene when you choose both of them. I don't know much about modding let alone how to programing. So at this point, I'm just wondering if this can even be done.