Drag and drop for the most part.
There is a feature called "localcoord.origin"
The valid values are:
localcoord.origin = "Default"
localcoord.origin = "Left"
localcoord.origin = "Center"
localcoord.origin = "Right"
These have to be done because "X = 0" is different depending on the screenpack.
"Center" and "Default" are the most common (Center is sometimes seen in 1.0 4:3 screenpacks but not always) but I have seen some widescreen screenpacks that use "Left".
Elecbyte code is weird...
These go in your screenpack system.def, if it can not find it it defaults to "Default"
Via ikemen discord. I'm on MFG as well. For now no new developments from me, I'm currently working on updating old Lua files to work with latest engine iteration (using them as it is would be a downgrade compared to what's currently available in Gacel's and Neat Unsou's forks since they are missing localcoord and some other features and bugfixes). Once done I'd like to finish implementing Tournament mode and maybe some other minor stuff in Lua side of things.
Screenshot is one feature you added K4thos, and it's not dependent on lua files.
The IKEMEN discord link was posted in the Discord Links Ahoy! thread.