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I don't have the dovetail system, so I can't comment on it. I have worked
our a good system for the F-type extensions and for adjusting the level of
the infeed table to get it exactly in line with the outfeed table when not
using the jointer:

Jointer Table
I zero a digital dial indicator on the infeed table referenced to
itself, then tip the indicator up on it's magnetic base so that the
indicator tip safely clears the blade.
Then I indicate the outfeed table referenced to the infeed table
(magnetic base on infeed table, indicator tip on the outfeed table), and
using the palm of my hand to tap the adjusting lever, I position the infeed
until the dial is zeroed. Voila! With a little practice (I got lots when I
had to adjust the tables for parallelism!) you have both tables co-planar
within 0.0005 inches in under 30 seconds.

F-Type Extensions
Obviously, this is much trickier due to the need to adjust the lower
bolts. However, I figure the most important aspects of this are:
1) Making sure the two tables are exactly at the same height where they
are closest to avoid "catching" of the workpiece in either direction.
2) Making sure the extension is even or rises slightly (say .005 at the
end farthest from the table) ) as you move away from the table. I let it
rise as I figure when I put weight on it, it will sag a bit.
With this in mind, I adjust the two screws leveling the height of the
extension with the method above. Be ALL screws are in contact with the
table by feeling the increase in drive torque as you rotate them into the
table. Tighten down the lock nuts.
Then I adjust the lower bolts so that the extension rises slightly. Be
sure BOTH bolts contact the table. This usually takes me a few tries.
Tighten the quick lock before checking with a straight edge. Tighten down
the lock nuts.
Then rezero the height using the procedure above. I have found that
unless I have to move the extension adjustment screws a lot, I am still
within 0.005 on the plus side for the end of the table.

When I first got the machine, I did not have a lot of confidence in the
extensions to maintain accurate table alignment in use. I could not believe
Felder didn't have custom, flat headed bolts to rest against the table. I
guess the $.50 they saved per bolt was worth it to them. After some
experience (not enough to speak with authority), I have been pleasantly
surprised. They seem to be holding the initial alignments well. I have NOT
put much weight on them yet, however.