Hooray! That means that my finding index system is probably correct! (yes, we have everything except arguments names the same; but thanks, anyway ^^)
But yes, as coleislazy said, it's strange that there isn't built-in block for that. And it's even more strange that there's block which requires using this functionality ("remove [item] from [ list ]", to be more precise).
Oh, and since it was mentioned, multi-dimensional arrays system would be nice, too. O.o