What are the limits of the Random Dice Icon Plugin?

What can I do and not do with the plugin? For example, I want to add modifiers to a roll. how can I do that if it is possible? I know for the normal dice plugin it works like this output ([dice(numDice+"d6") + buffs + debuffs])

But for the random dice icon plugin I cannot do that. Also is it possible to lock only specific dice with locker plugin?