This has been suggested, right now you can only control visibility on the add page but we will be adding the ability to control the visibility of fields on both add and edit issue pages.
Here is a link to one of the issues:
https://bugnet.codeplex.com/workitem/224
Right now you would need to edit the IssueDetail.aspx page and set the Visible property on the field you wish to hide to achieve this.
Here is a link to one of the issues:
https://bugnet.codeplex.com/workitem/224
Right now you would need to edit the IssueDetail.aspx page and set the Visible property on the field you wish to hide to achieve this.