The double elimination system is planned.
If you mean the ability to add tournament administators, it’s a feature that we have planned. We will give it a higher or lower priority accordingly to the votes it gets here.Timothy Taylor commented
Tournament administrators would be nice but this is more for the participants to be able to record their own results.
Player1 and Player2 have a match and either one of them can login to record the results but are not able to record results of other matches that they are not participants of.