Split Buying/Selling Investment Fund Automation

Pretty much the title.
I'd like to have my investment funds automatically buy things for me, but I hate that they sell investments I spent time setting up manually as soon as the company's P/E is greater than 50.
I'd like to be able to enable automatic buying, but disable selling

@Hern I don't think atm I would use it but I like where you are going.

Something in settings would be a good place for this

Or even being able to set different settings for different stocks.