Direction bias when using `auto`

[RazeiXello]

To add on to this closed issue, would it be possible to specify a direction bias for the auto property?

Something like auto-left auto-left-end etc.

Currently Shepherd seems to have a bias for the right side in auto mode when there is enough space for it to be anywhere.

Here's the CodePen I used for the screenshot. https://codepen.io/RazeiXello/pen/ExRjyLW