This time I have an easy request. Often I use Preview in fullscreen mode to read some stuff. But I prefer to magnify the pdf to full screen. For this you only need to press the F Button. To get back to normal size you have to press A. 
It would be great, if a long press to the plus sign magnifies the pdf (simulate F Button), the minus sign does the opposite. 

thanks for letting me know. I didn't know of these shortcuts before. 
And I'll certainly add support for this!

Best regards, 
Felix