Key layout should be customizable

I love swiftkey, I use it since it was an independent app and even paid for some themes; however it hasn't evolved as much as I think it should, for many years. The most annoying detail for me is the absence of angular quotations ("«" and "»") in the Spanish layout. These are the preferred quotation marks in Spanish writing, over "", which forces me to write incorrectly when on my phone. The thing is, even if this was added, it wouldn't be enough. I can think of tens of different key layout details that make my writing more uncomfortable or inefficient. Therefore, I wholeheartedly recommend you to allow users to design their own key layout with any unicode character they choose; you can get great community templates for free and we can get writing just as we like it.
Thank you for your time.