How to Make Capacitive Touchpads in Fritzing

Hi I'm trying to make a specific triangular copper pad for my fritzing project that involves capacitive touch. The pads need to be a very exact shape and size and I can't seem to figure out the best way of doing it. I have tried various ways;
• The masking copper fill technique you have described ( but these came out rounded and pixel jagged and a different size to the starting shape )
• Just making an svg and importing it as a logo to set in the copper layer ( But then you don't have connector handles to run traces to it )
• Creating a custom fritzing part ( but then these can't be placed in the copper layer.
Any thought of ideas?