Old Cubase Pro 5.5 no ctrl/shft in FL Studio

I would like to ask if there is a way to tell Cubase to allow sending CTRl and SHFT commands into VSTi plugin FLStudio 12?

I am fighting with this for ages, but only now decided to finally ask here…

So, any solution to this (initially I wanted to re-assign keyboard shortcut mapping in FLStudio but it is so lame that even in 2020 they do not allowed changing it, unbelievable)?