You will find instructions for SBD Relaying under the Features list from the GSatTrack WiKi. Go to GSatTrack.com and click on the "Support" tab, then click on "WiKi". See the navigation panel to the left and click on "SBD Relaying" at the bottom of the Features list.
There is a certain level of engineering support required by our partners, along with a certain level of support staff in order to qualify as a direct partner with GSE and in order to qualify for partnership discounts. The application is short and you will receive results within the next few days or sooner.
The greyed out functions you mention associated with that geofence will only be enabled if there is an asset currently located within that geofence. For example, "Send Message" would only send a text to assets within the geofence. So if there are not any in the geofence then that function becomes disabled until an asset is inside the geofence.
The GSatMicro does support the PECOS format for short position. The long position format could be supported as well. Since the GSatMicro is quite flexible in terms of programming and message packing, the scripting capabilities make it quite easy to build features like this.