You DON'T want to do that. Trust me.
My husband accidentally plumbed our toilet that way once. The hot water will eventually melt the wax ring and...I'll be honest...the "steam effect" makes an extended stay on the toilet a very fragrant experience. And it makes your butt sweat.
Oh God! I didn’t even think of that.
Thanx for sharing......seriosly, though, regarding poor drainage - go to Walmart and buy their version of Alka Selter tabs - plop, plop, fizz and you're de-funked.