You can customize the rules for the type of tournament you wish to run. Allow for disqualifications or don't. Allow for countouts or don't. Set a time limit or no time limit at all.
Have One-Fall Matches, Two-Out-Of-Three-Falls Matches, Iron Man Matches and Death Matches which don't end until somebody has won three falls back-to-back.
Use Ladder Matches, I-Quit Matches, and Falls-Count-Anywhere Matches. Or stick the competitors in a cage and go old-school where the only way to leave the cage as the winner is by pinning your opponent or making him submit.