A few versions ago I had combined the DLCs with the base game so I can see the scenes within normal game play.
I did also finagled some of the code to remove route locks, Also removed the automatic "Next Week" skips from certain routes such as the Garcia ones, and made it so I can trigger it manually or Within a set days based on the Skip card.
I also implemented a means to "replay" scenes again. Think of it as more a repeatable version of the original scenes. I was in the process of making a randomized dialogue system for these repeatable ones based on stats (Might act more horny or less horny etc.) to keep it fresh. However Life had other plans and I stopped.
Not sure if there's an easy way to make "mods" for RPG maker games without overwritting. Either way, with some trial and error anyone who wants to try and "improve" the game can do so.
Honestly the biggest hurdle was writing all the potential dialouge, renaming some of the CGI to other names and also finding/making surethe right images are being called for the changed ones.
Edit : It's also one reason why I prefer RPG maker over the Renpy one, For me it's easier to "mod" or change some thing to my liking in RPGmaker. Renpy feels like it's a too much.