Yeah designing missions after the main storyline would be pretty cool. Make it really elaborated or how ever you spell that. You would get tons of choices such as:
-What type of mission?
--Assassination, you could actually kill off people from the storyline
---choose a character from the storyline
----choose when to do it
-----choose who helps you
------choose what you're gonna use to get the job done
--car theft, you cant leave this one out..."Grand Theft Auto"
---choose a vehicle
----choose from a list of areas its at
--Protection buyers, you go and make them pay protection
---choose a property
----choose how you'll do it
-----choose whos involved
--Gang war, sorta like SA but more organized
----choose part of gangs territory
----- choose alliences involved
------choose weapons ect.
--Property destruction, blow up anything to get what you want or just for payback, "Payback's a Bitch"
---choose someones property to blow up or just a random list of other properties
----choose alliences involved
-----choose how to do it
It would be even more elaborate than this...I think it'd be kick ass and it would give you something to do after the storyline.
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