Soap: getCustomFields()

I'm using soap to populate Jira. Working with custom fields is difficult because you have to dig out the custom field ID from deep in the administration of Jira. Since the Soap API already has methods such as getPriorities and getIssueTypes, it would make sense to have a similar method such as:

getCustomFields(token, projKey)

which would return an array of the existing custom fields. I would like to suggest this feature.