Upd 15th Nov: 
Meanwhile I wonder if it's just me facing this issue. It would be helpful to know whether or not this colums are really not available or if it's just a problem of my settings.
My post read:
I tried to include the "Tempo" data and also the information from the "custom2" field of my songs as a column in the library window but with no success. Those fields are not visible in the available colums list where to configure colums. I also tried to rename Custom2 but could not figure out how to do that. Has anyone an idea whether or not there's a way to get that?
cloudygit
Meanwhile I wonder if it's just me facing this issue. It would be helpful to know whether or not this colums are really not available or if it's just a problem of my settings.
My post read:
I tried to include the "Tempo" data and also the information from the "custom2" field of my songs as a column in the library window but with no success. Those fields are not visible in the available colums list where to configure colums. I also tried to rename Custom2 but could not figure out how to do that. Has anyone an idea whether or not there's a way to get that?
cloudygit