you do get a extra bonus actions... called cunning action, in 5e its limited how you can use this bonus action...
-"Starting at 3rd level, you can use the bonus action granted by your Cunning Action to make a Dexterity (Sleight of Hand) check, use your thieves' tools to disarm a trap or open a lock, or take the Use an Object action."
So you could toss alchemy fire, grease bottles, if i recall my 5e rules...as those are a object action... we have to ask anyone that played a rogue in the latest play test, how larian handles cunning action... hope that helps...
In PnP rogues can use their bonus action to do things that would normally take an action. But they do NOT get any extra bonus actions. That is a BG3 EA thing.
But a fighter 11/monk 1 multiclass should be able to get 8 attacks in a round using action surge and flurry of blows.
