fanning within buddy's

This has been itching at me for a while now....

If i have a group of 20 fixtures , in 4 clusters of 5 fixtures each , if i want to jump between clusters without creating a group for each one i can choose the group of the 20 fixtures , put 5 in the the buddy's tab in the segments window and pressing group+next would jump between the clusters.

Now to my problem ,

if i would like to fan the tilt value of the selected cluster i cannot do it because the desks treats this as 1 fixture , if this could be solved it would be super useful and would make focusing (for me at least) much easier and faster.

Thanks!