I not sure if I'm missing something.
Dice Roller > Manual line: is there a way to add dice together to get a total?

 Example d8 + d4

 Assuming all the check boxes will also work Reroll Max, Record Each Die...

No, if you want the total result of the dice in the manual line, you need to add them together yourself.

But, yes, the other options still work.

In reply to bigbadron (msg # 2):

I kind of figured that even though the help menu says it adds.

/help/?page=post
+Dice Roller > Manual: If the player would rather enter the rolls manually, the instructions can be typed here.  The form is <# times to roll>d<# sides on die>.  A + or - can be added to add or subtract a number from the roll.  Multiple rolls can be made in this way by placing a comma between the rolls.  For example, 3d4,1d8 would roll three four-sided dice, and then add an 8-sided die rolled once to the total; 1d20+4,2d3 would roll a twenty-sided die once, add four to that roll, then roll two three-sided dice and add them to the total.

It's coming.  link to a message in another game

In reply to jase (msg # 4):

Cool, thanks.

Appreciate the work.