Now as we have JUST had the whole problem spamming suggestions ( we all know who it was :P) im a bit wary of posting this....
Basicly as the name suggests i propose new pen shapes i mean we HAVE circle/oval and square/rectangle but why stop there? I'm not sure if this has been suggested before (im FAIRLY certain it hasnt) and im not familiar with how the coding for the pen-shapes work so i cant be certain on whether or not it would be an extreme job of coding but i think adding other shapes could benefit TPT , the first "logical" ( just probably the next simplest shape) would be a triangle
Even if this is shot down in the first 3 comments i figure mabye some1 can use it for their mod :P
It's remotely possible, but at the moment, square and circle, as well as all the modifier buttons pretty much fulfill any need anyone could possible have short of absolute decoration. Were it necessary, sure. But pens are a mess to modify, and we still have glitches from way back when they were toyed with before just with adding the brush modifications.