As someone who used to work with spreadsheets extensively at a bank, I can tell you that some kind of stack/queue functionality would be a godsend.

For instance, in this mode you hit Ctrl+C five times, then the subsequent five Ctrl+V actions paste the data in FIFO order. It may not seem like much, but going in between app windows in order to grab data is a big time sink. Being able to copy items sequentially and then paste them sequentially would be a killer app in most Excel heavy office workflows. You could also add a toggle for LIFO, or maybe some keyboard shortcut / chording for toggling modes while the user is pasting.

I had actually tried to implement this as a hobby project but truthfully, my MVP was rudimentary at best because I’m inexperienced at COM+ and developing for the Windows Shell.

Edit: I’m using ‘Stack/Queue’ loosely, not in the rigid data structure term of art way.