If you do something without asking for DM approval because you genuinely did not know it was advisable to ask, then that is not a problem. However, if you deliberately choose not to ask for approval because you know it will not be granted then this is not acceptable.
Most people have a pretty good idea what will be permitted and what will be refused. Deliberate abuse of this will be treated as a breach of the rules, with appropriate punishment.
This counts as part of the 'Common Sense Rule'. Please don't do it.
