Anyone using the *AFTER *READ Triggers in V5R1/V5R2?

Hello, all:

Has anyone used the "native" *AFTER *READ triggers that were
introduced with V5R1?

I tried using one, but no matter if I change data in the "original"
buffer or the "new" buffer, it does not seem to matter; the actual
data from the file is ALWAYS (apparently) returned to the calling
program, regardless of what the read trigger does.

What the heck good is a read trigger if there is no way to alter
the data in the buffer?  I mean, after all, you can alter the data
in other cases, such as an Insert or Update trigger, right?

Thanks,

Mark S. Waterbury