Sorry if it's already been requested but I really would like to see:
"Pin" button on modules to lock an individual module to its place in the row. Like "Rack Lock" but on a per-module basis. There are some modules that I never want to see bumped or swapped until I'm ready. Probably would need some logic programmed for how it would interact with functions like the "push left/right" and row swap.
Link adjacent modules. Like pinning, above, only to another module. Use case: Link a module and its expander(s) and move them as a group. Link a series of modules always used in a chain, and move them around like a block. "Pin" a selection of "linked" modules to their spot on the row, and they will be impervious to accidental swaps and shuffles.