Add calculated columns

[feois]

First of all, this plugin is cool af, thanks for making my life easier.

I'm proposing a calculated column feature that produces an output based on other properties. IDK how this plugin is implemented but I figure it might be possible using Expression.

For example, I currently use resources for weapons so I would like to have a DPS column that calculates using damage and cooldown so I could manage stats balancing better.

[don-tnowe]

Actually great idea. I had problems with editing sub-resources, so setting-getting with any expression would allow both derivative values and editing subresources in the table.