I have an function that would look much nicer as an operator.
We can use append as an example, lets say I want to use +
so
$foo + $bar
rather than
array:append($foo,$bar)
There is nothing obvious that I could find. I strongly suspect this isn't possible.
There is no such capability in the 3.0/3.1 specs. You could add it as a 4.0 request at https://github.com/qt4cg/qtspecs, but you'll have to put forward a strong argument. My suspicion is that it's much harder to do in a weakly typed language, especially one that has a lot of implicit type coercions.