Add or remove attribute and sort attributes

Hi
pls consider to add this features

1- as i tested the last version, we can add only the attributes that previously used at least for one product
i want to add or remove attribute and to insert value for(not just select previously added values) added ones

2- ability to change the order of attributes by drag and drop

3- and finally if you could the ability to categorizing attributes, it will be totally perfect
i mean, we categorize attributes and add subattribute that everyone has it’s own value

is it possible?

https://ww.wp.xz.cn/plugins/woocommerce-bulk-attribute-manager/