Hey, I wasn't sure how to move a run-up in position on leaderboards. In a minimum rockets category and need to put a run higher because of fewer rockets but had a slower time. Not sure how that was done. I am a mod FYI.
There’s no way to manually place runs on a leaderboard position. One thing you could do is put the number of rockets used in the hours space.
As @Pear said, there is no way to sort runs by extra criteria other than time.
One thing you could do is follow the suggestion by Pear, and add the rockets amount as hours to the time. It will be ugly, but it works.
Another thing you could do, is to make the category of "minimum rockets" more precise, and NOT allow submitting runs with arbitrary amount of rockets. For example, suppose that the current known amount of rockets required to beat the game is 15 - then the category can be changed to "15 rockets", and only accept runs with that specific amount. If someone manages to find a way to complete the game with fewer rockets (like 13), then you can either wipe out the previous leaderboard, or split the board into several categories.
Another option is to follow what the Rayman damageless category does, which is use an additional time field to manually sort the runs, that way you could sort first by number of rockets used and secondly by the time of the run.
If doing that, it would also make sense to add "number of rockets" as a user-defined variable, since you don't currently seem to have that for the category.