TBH, I wouldn't mind if this mod was my only christmas present

can you explain some more bsraven? do i have to copy all the fretsonfire.ini content from the appdata folder to the new ini just created?
No, leave it blank.
Do you think you can fix the problem with the disappearing notes? I.e., there are notes that have visible trails, but don't appear themselves. Most of the time they disappear in groups.
Don't use the FoF theme. Change it from Settings -> Coffee Settings.
SIMPLE FIX FOR 'MORE' HOPO PROBLEM IF YOU STILL GET IT:
Create a .txt document in your UCMod folder named "Fretsonfire.ini" (This is if you have "Show File Extensions" active), and change your settings in-game.
Don't forget this solution of mine!
Well, you could do that, but don't save it as a .txt! Otherwise it'll be fretsonfire.ini.txt :;):
Just create a blank file on notepad, save it as fretsonfire.ini and set to "All Files".