With the new masking tool in 11.0, it's great that it identifies multiple subjects and masks all of them. Total game changer. But sometimes you only want one subject among many in a frame to be masked. It would be cool if there was some way to remove subjects from a mask that is quicker than the brush erase tool. Clearly, Lightroom can distinguish individual forms as subjects. But right now, it just lumps every form subject into one mask and pin, unless I'm missing something. So what if each subject form had it's own pin within the subject mask? That way, you could just select the pin for a given subject form and hit delete if you didn't want it masked.
Another work around would be if you could pre-identify which form in the frame you wanted masked. Maybe there could be a cursor tool in the subject mask panel. You select the cursor tool in the subject mask panel and move the cursor to the subject that you want masked and click it. Then only that subject would be masked. You could even do a shift+click to select multiple subjects. Say you have three subjects in a frame but you only want two masked. You could hold down the shift button and then click on just the two subjects that you want masked, leaving the third subject out of the mask.