Dice Rolling and Target Numbers

A campaign we are working in uses a dice system with Target Numbers. This system (Ironclaw), uses a variety of different dice sizes. So, the players may have a target number of 3, but have to roll 1d12, 2d8, and 1d4. As the dice system currently is, we would have to roll three different times and mentally add successes. Would it be possible to add functionality for this? So we could type '/r 1d12+2d8+1d4>3' or something similar?

For what it's worth, it looks like "/roll 1d12>3+2d8>3+1d4>3" does what you want. On the one hand, such a notation is more flexible (as it allows different target numbers for different dice), but it may be a bit too cluttered for some.