In Yahoo Finance, I have been manually adding color-coding horizontal lines at the price levels i make buys (color A) and sells (color B). and i add the average cost/share (Color C). This way I can see at a glance what min levels sell at and max levels to buy at to make it a prudent transaction.

I think this would be a helpful tool to add to Alpha Space. When pulling buy and sell transactions from Yahoo Finance portfolios, assuming you're storing these in a database, when refreshing the Alpha Space, check if the user has auto-markings enabled and which elements they want to see, and then populate those markings on their chart for them. This would save a ton of time and has proven very useful for me.

At the very least, adding the average cost/share would be very helpful.