Action or pluging to draw symetrically along an axis

[darktiste]

Hi i am currently using photoshop cs6 i am looking for an action//plugin that could help me draw symmetrically along an axis both horizontally or vertically.If you know if such action exist or you have the know how i would be interested.The main purpose is to speed up the process when doing character design in front view.If possible the mirroring would be shown in real time as i use the brush rather than be taking effect after pressing or doing a few shortcut also if possible the erase would be able to erase in the same fashion.Thank you in advance