Change accelleration in Skeinforge

Skeinforge seems to have pretty slow accelleration values - as a result prints take twice as long as SLIC3R prints.  Based on the sound during a straight run, I would say it takes about a second to get to full speed (at 50mm/s feedrate) so guessing the accel is about 50 mm/s2.  How can I increase this?  I found the menu in the SLIC3R configuration but cannot find anything similar in Skeinforge.  I am using a stock SD4 (received a month ago, no firmware edits or other mods).