A "good thing" from the perspective of those who use them against you, because any such security scheme where authorization requires a 3rd party is implicitly holding you in the same level of contempt as any author of malicious software, and using your own property to enforce it.

It could be a good thing at best if such binary signing capabilities were made available to the user, with the ability for them to grant the highest levels of access should they desire (which, under Symbian, you definitely were not.)