Add config option to defer scripts

Thanks for the issue @rupl.

Do you think we can get away with universally adding defer?

In keeping with the project mandate, build in configuration is something I want to avoid.

At most, I'd want to make it alterable by a render alter hook or something.

Is the local caching necessary to achieve this? this is a feature I'd really want to avoid. For which the main GTM project → would be best.

Do you think we can get away with universally adding defer?

Adding it universally would be possible and I'd personally like that, but it creates a chance that some very quick bounces aren't counted. Some folks would undoubtedly find it undesirable.

Is the local caching necessary to achieve this? this is a feature I'd really want to avoid.

Yes, using the <script defer> requires an external JS reference (using the src attribute). So the module would have to write JS to the files dir during cache rebuild or cron. If that's a deal-breaker then I'll go ahead and close the issue.

Thanks for the response!