Stefan, it would be wise to also keep a offline option open for developers.
e.g my internet is down alot or i'm on a plane. I cannot use internet so I cannot develope.
Ontop of that only being able to correctly develope online is a unheard of concept. You also take the option away for people to improve their so called skills due to the simple fact that they cannot practice but are forced to work on a server to be able to learn. This will basicly be the end of graal as a development game cause talented scripts,coders and other "already talented" people will work on servers and no new talents will be born
(Ontop of all that, I hate being online on a server. People always manage to bother you with idiotic stuff and especialy when your staff. I know cause I do it myself 9 out of 10 times or i'm a victim of it :P)
Edit:
It would be so.. cruel to cut people off from the kick ass particle system :O and leaving them with simple showimg's
