There is PangoScript command:
DropFX 1,1, 1000 // Layer, Index, duration ms
Please pay attention - drop effect is a part of "Live Control" group of commands and you need to select what live control you want to use - cue, master, zone. This is same for all similar commands such as Size, Rotaton, FX and so on.
You should use MIDI to PangoScript table in MIDI Settings. You can assign script command to a MIDI message.
Regards,
Alexey