Fairly simple to use. Instructions in the comments.
Let me know if you use it. I'll be happy to fix any bugs! I've got some ideas to improve it as well.
If you turn logging on then you get the results from all the dice listed, logging off and you just get the final result.
I'm finally doing something with my Roll20 account and it is the EotE Beginner Game (which might transition into a core game). I used the tables feature with tokens for the dice rolls. It works well, but I find it hogs up too much space in the chat window with unnecessary line breaks and irrelevant data (like totals), so the logging "off" feature makes this doubly attractive to me. It's probably worth upgrading to a Mentor account.
I don't think error checking will be an issue, as I have all the character skills and difficulties on macros. As long as the players stick to those, it should be fine. Of course this means the difficulty is rolled separately. The macro rolls will ultimately still have to be resolved by hand, but I already have to do that now. If they behave, I might even consider letting them roll manually. ;)
It doesn't seem like it would be feasible to work into this code, but if you happen to need the core dice symbols for anything else I have made up quite a few variations.
Edit: Just saw your other script. ...so I suppose it is feasible. ;D Anyhow, I have those symbols if you'd like to give them a spin, they might be a good alternative for people with smaller screens (that's what I made them for). If you want 'em, let me know.
