More drawing tools

[Mia]

Please give us more tools for drawing rather than a circle. I'm thinking a square! I've noticed the size 1 circle brush on PR2 is rather finnicky, as it can create some blurry lines like this:

[Camer the Dragon]

Aliased option for brush would be good (i.e. a binary yes or no as to whether a pixel is coloured, good for pixel art)
(Anti-Antialiased brush)

[Master Raiden]

It would also be nice to change the opacity of the brush