Damn straight it would be a lot of work and whether it would solve the problem of spam or not....can you imagine the outcries from people when their posts get rejected?  We've already got members screaming that bitcointalk is like the censoring division of the bitcoinazi third reich when they get posts deleted or whole threads trashed.  That would create even more work for the mods and even more drama around here.

Not a good idea.  It's not practical, and the current system of dealing with shitposts/spam:
....is the best way right now. 

I do think more mods are needed and maybe some other changes, but I also think people aren't hitting that "report to moderator" button nearly enough when they come across garbage posts.  I used to spend hours going through threads in the Bitcoin Discussion section and reporting zero-value posts until I got tired of doing so.  I think maybe I'm going to reserve some time in the near future and do some reporting.