Feature request: customizable region capture size presets

[Sebioff]

Hey,

I use wcap almost daily, it's super useful! Thank you so much for creating it!

Now for my request:
When capturing a region, there's a number of size presets that you can apply - that is really good, but as far as I can see it's not possible to customize those sizes.
It would be incredibly useful if they could be modified somehow, even if it was done by changing a config file or something.

[mmozeiko]

Yeah, that's reasonable to add to config. I'll do that.