It sounds like its possible based on this:
http://wiki.developer.myspace.com/index.php?title=App_Invites#Including_contextual_information:_Custom_App_Params
but unfortunately, theres no documentation on it! Here's my code, its using OS 0.7. Im assuming that I just need to pass some params into the existing call that will get added to the invite button. Anyone?! Thanks in advance
function sendInvite(userId, name, thumbnailUrl, profileUrl){
var params = {};
//Set The title of the message
params[MyOpenSpace.Message.Field.TITLE] = "Title Of Invite";
//Set the type of message
params[MyOpenSpace.Message.Field.TYPE] = "SHARE_APP";
var message = container.newMessage('Install vDream Message', params);
container.postTo(message, postback, userId, name, thumbnailUrl, profileUrl);
}