As Agile User I want to drag planed sprints or have separators for my backlog

can you please make planed sprints moveable? we do use "dummy sprints" to hold certain issues (like "to be analysed" for error tickets,..). when planing ahead with lots of sprints you
a) don't know exactly how many sprints it will be
b) you have really much unused space in between your active and next sprint and the backlog

if we could move sprints I could just add new sprints when they are needed and drag them above the dummy sprints.

another way to improve this completely would be a way to "split" the backlog into user-defined sections where you can better groom your backlog. so we wouldn't have to create dummy sprints at all