[Plugin: Gallery Plus] new size not available in galleries shot tag ?

Hi,

This is a must BUT

Looks like not useful for [galery] tag ?!?

I’d like to use something like this:
[galery size="crop-50x50"]
when I set a “crop-50×50” additional size.

really missing or I did not understood something ?

Thank you

https://www.ads-software.com/extend/plugins/gallery-plus/