As of now, we have a way to manage which of the native fields should be visible. However, we don't support re-ordering such fields.

For custom fields, we provide the ability to control their visibility and order relative to each other.

We don't provide a way to define the order of custom fields and native fields relative to each other.

Based on users trying out MantisBT, it seems that often users would like to change order of native fields and interleave custom fields between them. Hence, some standard approach to enable that would be make sense.