1.
The built-in default presets are hidden by default if you already have multiple custom presets. Use
SHIFT+CLICK <Presets> to reveal both built-in default presets and custom presets. If this is behaviour is desirable or not is up for debate and I have no particular preference. The default presets were added to make the presets feature more visible to new users.
2.
Pretty much.
{acf} is there for convenience but of course doesn't add anything that could not already be done with
custom code. See
{acf} implementation details.
3.
Typo. Good catch. It's
{ct} creation time and not
{cf} container format. I'll update the release notes.
Your feedback is much appreciated. Thank you!