ConfirmKill cydia tweak allows you to select specific Applications which then require a Confirmation before they are removed from the Multitasking Switcher.
You will be prompted to confirm the removal if you selected this app.
You can select important Applications so you can not accidently remove them.
Select the Applications that you want in the Preferences App. Scroll down to “Confirm Kill Settings” and select / deselect your Apps. No respring required after selecting an App.