I found time to test it today and it seems that #20 increases the amount of weapons you bank with each shot the longer your combo goes (= third shot 2 weapons, fourth shot 3 … max 5 weapons each shot). If you enable #29, you will get all the weapons of your recent combo twice, as long as you end your combo in the scoop. Makes for an interesting combo system if you ask me. I enabled #29 and set #20 at max 2 weapons each shot with a combo timer of 1 second in order to make combos intense but not overpowered.
I also found that #17 colossal jackpot difficulty is problematic: setting it to easy actually makes it hard (6 shots to qualify) and hard makes it easy (2 shots to qualify). Sorry if you knew this already!
The last discovery I made was that #30 start lil deadpool difficulty must not be set to hard because it seems that you can only play the first mode and the second can never be qualified - it always says you have to complete a battle or quest to advance but then never triggers… or probably I am missing something?!
Love the game by the way! (Clone Multiball is lame though…)