So, you only have .amxx file, and you can't edit the plugin?
If so, you have to decompress .amxx file, change the corresponding bytes (parameter pushes, function call) to NOP instruction, and compress it back.
I've written decompresser, but I couldn't manage to write a program to compress it back. Maybe I will give it another try in a few days.
EDIT:
I feel dumb here... Are you trying to "hack" a plugin or a module/game DLL?
Because all that I written before is to not a run-time hack, and only works for plugins.