Option to edit question

Questions posted by you, yes you can edit. Questions posted by others, you can't edit. Only Admin or moderators can. Only spam posts getting edited or removed regularly.

Yes I agree, we should not edit others question. I have seen some questions not able understand or not clear. These kind of questions can be edited by certain people who answers question regularly. ex:- stackoverflow has this kind of feature

We are adding functionality where moderators can edit questions, accept answers and other things.