BookLock allows you to block the option to delete Bookmarks from the LockScreen

  BookLock is a new tweak released today in Cydia, and with its help, iDevice owners can block the option to delete Bookmarks saved directly in their own iDevices. Normally these Bookmarks are treated the same as any other application icons and can be deleted through the normal procedure, but BookLock changes this. The tweak gives these Bookmarks the status of applications installed directly from Cydia and blocks the display of the delete button until you allow this.

Did you add a REALLY important bookmark to your home screen? Afraid of the possibility of it getting deleted? Fear no more. As long as BookLock is enabled, there will be no possibility of bookmark icons being deleted. Configure options from the Settings app.

  BookLock is available for free in Cydia.