Does the plugin consider the on-sale price or regular price when calculating the price of the bundle?
Can a bundled product be variable?
No, because a ‘bundled product’ is a product type and a ‘variable product’ is a product type, therefore a bundled product can never be a variable product.
However it is possible to add variable products to the bundle.
How does the inventory management work with the bundles?
The stock of the bundle and the stock of the bundled items are managed individually, so, if you purchase a bundle, both the stock of the bundle and the individual stock of each item in it will be reduced.