In my opinion SELECT ... FOR UPDATE is already quite powerful to add locks. 
Might not be as good as a straight table lock, but gives you enough power 
to lock by rows (select some indexed columns, most dbs will lock only rows 
matching them) or select by a non indexed column which will probably end up 
in a whole table lock.
As said above, dbs have many vendor specific lock types that might get 
quite complicated to abstract without limiting functionallity.

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