The option to adjust Brush Size to be Alt + Right Click like it is in Photoshop. I've seen posts since V1 requesting this and I'm surprised this hasn't been added yet.
Affinity's current combo of Ctrl + Alt + Left Click just feels really clunky and unnecessarily complicated.
I've used Affinity for years now and it still feels odd. Giving us that option to change it in Preferences > Shortcuts menu would be great! Especially with new users switching to V2 from Photoshop would help ease them in better. Loving V2 so far! Keep it up Serif!