They wouldn't be able to connect at all. If forge does its job (which I am sure it would) the client would be kicked before ever connecting with a list of missing mods.
After reading into it a bit more it sounds pretty much terrible so far. They are going to have to pull a rabbit out of a hat to really keep me interested. Sounds like cookie cutter MMO #985.
Is free wondering like free running?
I think it must be similar. Free Running justifies running around a town like a jackass jumping off shit, and free wondering is basically letting your mind run wild and ask stupid questions without consequence.
There is nothing wrong with using an IDE, especially for a beginner. They promote good coding practices and help find compile errors before they happen.
edit: Eclipse es #1 huehue
Well I wouldn't say incorrectly told. If someone is posting about a chat window you can only assume it's a Tekkit issue. Just generally confusing and uninformative bug report.