I cannot give default values on items because theres so many thousand possible combinations.
What if a forum wants to make it super hard, thus setting EXP rate to 1, then sees their items having 100 buff (which is to them hella lot)? They will have to change everything.
Similar with the other way around.
But for a future version, I will make it possible to import/export item sheets, so you guys will be able to share your items. Then, if someone is willing to make them, I can offer "Easy - Medium - Hard" item sheets.