RPG enhancement suggestion

I have been writing an extract program, to bring in data from a file on
an external system. During this, a question occurred.

Would file processing in RPG be a lot quicker if we could drop fields
that we weren't using, similar to the way it works when you internally
describe
a file, but without actually decribing the file internally.

eg: if I have a typical input file with 50 fields on it, but I only
actually use 1 field on it in the program, I would like a keyword that
allows me to
drop all the other fields from the file.

There must be 1000's of RPG programs out there that use only very few
fields from files, but read in every field on the file every time a
record 
is read

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