I can confirm that there is no mutliplaying in the trail version (I have both versions myself)
Multiplayer is more fun in my opinion when you are playing the campaign together.
I love Starlancer to bits... have done ever since playing the trail version many years ago. If people are wanting to try a multiplayer game I'd really be interested in joining in.
As far as it goes... I'd consider myself a veteran at the game (if only because I can complete the last mission...