Okay, so I'm looking at boomerangs a bit.
The two main ways I'm looking at changing the boomerang path are:
Jumping over it as it comes back. (JUMP OVER)
Jumping, then letting it come over you as it comes back. (JUMP AND FALL)
Fast falling after you jump over makes an effect. (FAST FALL AFTER)
It also depends on wether you use short hop or full hop (SH) (FH)
There's a lot of timing stuff, so the possibilities I list here aren't all that you can do.
For example there's this weird thing that happens
Throw it upwards JUMP OVER. FAST FALL AFTER. It makes a straight line. Good for hitting behind you in a straight line.
Throw it upwards JUMP OVER. It makes a shallow U-shape.
Throw it upwards JUMP AND FALL. It goes past you and downwards in an arc.
Throw it upwards JUMP AND FALL THROUGH PLATFORM, it goes straight down behind you.
Throw it straight JUMP OVER, it goes behind you and up in an arc.
Throw it straight JUMP OVER SH. FAST FALL AFTER. Goes a bit up and then straight line.
Throw it straight JUMP AND FALL SH, it goes past you and downwards in an arc.
Throw it straight JUMP AND FALL FH, it goes past you and sort of an upside down U.
Throw it down JUMP OVER, it goes straight up behind you.
Throw it down JUMP AND FALL, it goes over you and then goes in a straight line.
Also full jump is really good for JUMP AND FALL