Crit roll bonuses in macros

I'm working with an RPG system that doesn't have a pre-built roll20 character sheet. As such, I've been using character journals in order to create macros for the characters in my group.  With this system, critical successes act as a straight +5 to a roll in most circumstances (or more in certain situations). So my question is mainly if the macro system can handle this by itself (I did read the useful macro page , but I don't think it can handle what I'm looking for), or if I need to write a custom API script to do this for me.   At the moment, if I had to write it in code, it'd look something like the following: function calculate(dieRoll, bonuses, critLevel){         var total = dieRoll + bonuses;     if(dieRoll >= critLevel)){         total = total + 5;     }      return total; }

There's no way to do this with standard macros. You can set the critical on a die with /roll 1d20cs>18, and it will show the die as green when a critical shows, so you can add it manually. If your system rolls a single die, or a fixed never changing number of dice, you could make a rollabletable with the proper distribution and add the 5 to the results that would be a crit (but if your crit range changes, you'd need a different table for each possible roll - rollabletables suck for rpg purposes).  You could do it with an API script, but you need to be a Pro subscriber to use API scripts.