Can't find this in the Enhancement Requests, but it's all over the Community:
Quite simply, have a way to prevent users from deleting rows WHILE still allowing them to edit the unlocked cells in the row.
At minimum, create a popup warning the user they are about to delete a row. (there is a popup warning for "unlock row", but not for "delete row")
TAGS: Prevent deletion, deleted rows, restrict delete, block delete
https://community.smartsheet.com/discussion/37871/deleted-rows#latest