Specify screenshot file extension with argument/config value

[Gigas002]

Hello and thank you for your amazing tool!
I have a little question, regarding specifying the screenshot file extension on run. I know, the extension name can be specified manually with watershot -c path file.webp, but I'm using the watershot -c directory ~/screenshots instead. In this case it's not possible to force the file extension, it seems?

Not related to this, but also would be awesome, if we had an ability to override hotkeys in config file (e.g. I prefer to save screenshots with Ctrl + C instead of Enter and so on).