So, i've tried to cancel right click event to not display the trading gui with shopkeeper plugin's villagers, but it looks like even sending a message won't work, for example:
on right click on entity:
if name of entity is "&atrader":
send "&asomething" to player
and it just doesn't work...... however on normal villagers, the name works perfectly fine, just not on shopkeeper plugin's villagers. I really don't understand why?