I am really afraid that with out vro action I am unsure if we can achieve this .
Probably using some scripts it can be done. lets see if some scripts expert can educate us.
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Yeah but we could have hoped the possibility to have a user friendly disk list without using vRO was added in 7.5 (it seems it hasn't).
It should be pretty simple and I can't understand how they gave the requester the possibility to hide columns but you can't do it while designing the custom form...
I will introduce a feature request although I hope it's already in the works.
If you haven't already noticed, data grid is and has been a pretty big mess since it was first introduced.