ANYthing would be possible but make sure plz make sure it would be supported by the bandwidth, any website goes failing if it was slow, i mean really ppl get annoyed, i registered on april, but the site was slow over here, then some how on mid-may the sie became faster then started using the forum.
however u could add these (no need of killer graphics or so)
1)some chat box (tht everybody is allowed) to talk, u know, just instant messaging(however this mak cause the increase in incoveniece and long to use the forum,hence causing it to be deserted)this might change the true personality of free exam papers...
2)and yes, spell checkers, just like on yahoo answers. where it tells u u have errors and gives u sugestion to correct it.
3)able to attach things at pm, but things tht are not more than atleast 2mb, i mean common just imagine what will hapen to bandwidth if a dude was send 11mins (about 16mb or so)video to another guy.so its great to set the limit to atleast 2 mb of attachments.
4)add a scientific calculator when making posts..(withs sin,pie,cube roots,etc)
5)give students awards for each subject who worked hard or generally worked hard(who gave most helpful links, answered the most querries(where u would see the members name on answers to querries), and gave most helpful and detailed answer and wre really explained well) this would encourage other members to help others.other rewards tht does not include wearing off the abillity to get repped or repp