> Assuming that the difference in hardware lies mainly in the transmitting LED's,
> could I just add a few IR-LED's onto my transmitting board to extend the range?
> Having them connected to the TX line of course...

I'm no expert...

I think some (many?) of the IrDA compliant transcievers have a pin for
running an extra LED (for more distance, more direction coverage,
etc).  Running your extra LED off of this output is probably a better idea
than driving it directly...This way you know you are getting the
prescribed modulation, pulse width or whatever the spec requires...

Driving it directly may work fine, I don't really know the details.

-Steve

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