Cannot create an issue through SOAP interface when there's a required custom field. (getFieldsForCreate method is needed)

Currently there's no way to tell which custom fields may/must be filled when createIssue is called. So in the case where a (project/type) has a required custom field (and it is not known at compile time), you can't create issues through the remote API.

I suggest to add a method getFieldsForCreate(project, issueType), similar to getFieldsForEdit.