The only time I've used the EXTENTION button on e-bridge Toshiba's was to access the Fiery controller option. I'm not sure if the e281c had that option. I know the e3510 series can upgrade to Fiery.
Also, there is the GS1010 meta scan enabler but it is only for use on the ESTUDIO2830C ESTUDIO3530C ESTUDIO4520C ESTUDIO5520C ESTUDIO6520C and ESTUDIO6530C copiers.