Most exchanges question fall into the third party support: How to flag 3rd-party support questions?
But EtherDelta is a third party, but like other decentralized exchanges the contract's source is public. Some of technical questions can be answered (and even can be interesting).
Perhaps we should consider a line similar to: Should we discourage questions about exchanges, trading, buying?
Asking how things work, e.g. how does exchange X choose which orders to fulfill? Why doesn't this trading code work?
Any thing suggesting or asking for a view on valuation of something, e.g. what do you think will happen to the price of Y?