Feature Request: Delay Screenshot Creation to Deal with Loading Time

[MartinBubenheimer]

Some web pages return loaded state while dynamic loading of content is still in progress. In such cases the screenshot only contains a screenshot of the busy indicater, e.g. spinning wheel icon.
Would it be possible to configure a delay in seconds until the screenshot is exported? A delay in seconds would be totally sufficient to help with this issue, it's not necessary to auto-detect some event or end of loading.

Thank you very much!
Martin