Hi!
You need to bind the keys before the messages get sent.
<addon entityname="camera" plugin="cel.addons.celentity">
<propclass name="pccommandinput">
<action name="Bind">
<par string="trigger" name="up"/>
<par string="command" name="forward"/>
</action>
</propclass>
</addon>
If the keys are binded, did you try printing out a debug message under each of those events?
<event name="pccommandinput_forward1">
<print value="'pressed forwards!'" /> <!-- " then ' as the print expects a value. 'df' means a string -->
<default propclass="?pccraft" />
<action id="actid(ThrustOn)" />
</event>