My proposal is to add an option window to bypass the confirmation when deleting objects.
By adding an option window, you could let the user decide whether he wants to delete immediately or ask for confirmation. The user could always turn confirmation back on by accessing the option window.
Like most people, I delete objects all the time. Having to press Space to confirm deletion every single time is a waste of time over days/weeks/months/years. Even after putting the delete tool on my marking menu, I still wish I didn't have to confirm my choice.