Wow. I was thinking of attempting to code something extremely similar to bReakMyTeam. It's really cool that this already exists! The interface is beautiful and very easy to follow. A bug I'm noticing is that some of the color coding in "dual" mode is reversed (some OHKOs coming from my team are green while others are red). Another bug: priority moves in "dual" mode sometimes result in cells for both self and opponent to be marked as outsped. You might have already noticed these. I have a few suggestions as well:
First, I can see that some of the cells will resize themselves vertically, but they make the rows look kind of funky because neighboring cells will stay the same size (I'm looking at this with both "verbose" and "dual" modes selected). I think I'd like it better if each row had equal cell heights for more visual clarity. Just a nitpick.
Secondly, I'm noticing that a couple of the "break it!" results contain threats that require more than 4 moves to totally break a team. When something like this happens, can it be marked in some way (maybe with a strikethrough or italics on the 5th/6th move)? I realize one could see this just by looking through the results, but it's nice to be able to immediately notice it. I feel this is going to be especially important for those worried about Greninja in ORAS.
Also, I think it would be cool to see the moveset/held item/EV spread of each threat in a popover in the results. It saves time over looking up what is meant by "OU Common" for each threat out there.
This last one is probably a stretch, but it would be really sweet to have some kind of recommendation system for incomplete teams. It might make some sense to have separate defensive recommendations and offensive recommendations based on what you have trouble walling or sweeping, respectively. This would obviously require a lot of tweaking and could be computationally burdensome. Maybe another approach could be a calculator in which the user inputs the main threats they want to counter/check, and the results list in order the best teammates and how they fare against each threat. This might also be too ambitious, but I think it would be a huge benefit to those teambuilders who are looking to fill in a missing slot or two.
Really though, this is one of the most useful tools I've come across. I would love to help out somehow. Maybe I could add some sets?
EDIT: Under the options menu, the Light Screen and Reflect buttons are really easy to confuse, imo. I'd prefer having a "player side" and "opponent side" in there somewhere so I don't keep forgetting and having to guess.