I see your point about arbitrary restrictions mixing things up, but making that the only "gimmick" would be simply boring. It's sort of like:
Reginald: "I say, old chap, why don't we add a dash of excitement to our hum-drum lives?"
Timothy: "Smashing idea, me old mucker! What have you in mind?"
Reginald: "Why, I was thinking... No, no, stop me, this is far too revolutionary for proper gentlemen like us!"
Timothy: "Oh, do tell, Reginald! I explained to you how we could defeat old Fritz by replacing his Zeppelins with footballs!"
Reginald: "Oh, well, okay, but only because you scored the winning run in our nearly-drawn Test match versus the Canterbury Choirmice. Well, you see, Timothy, I was thinking that perhaps we should drink our tea with... *gasp* *choke*... ONE lump of sugar rather than two."
Timothy: "Down boy! Old bean, that's far too bold and exciting! But yes, yes, I can envision this world - a bright new future lies ahead of us! Let us march into this amazing new world together!"
