Unfortunately, NO.  Olympus does not have an extention for the RS-27 Foot Pedal.
If you need an Olympus compatible foot pedal with a longer cord, I recommend the FP-5000WP Foot Pedal.  It’s not made by Olympus, however; it was designed for compatibility with the Olympus DS5000 & DS5000iD Digitial Voice Recorders and docking station.
The FP-5000WP offers a few advantages over the RS-27, the main two are:
* The cord on the FP5000WP is 177″ long as compared to the Olympus RS27, which is only 67″ long.
* The FP5000WP is Waterproof.

Verification Source:
In-house testing