If a sustain pedal is not working correctly when attached to your ReMOTE, then you should check the assignment of the sustain pedal in the template that you are using. The settings should be as follows;
Control Type - CC
Control Number - 64
Low Value - 127
High Value - 0
Button type - Momentary
(The high and low values may need to be reversed, depending on the particlar pedal that you are using.)
If you then save the template, these settings will be saved. As with any assignable control on the unit, the sustain pedal is set up on a template by template basis.