[TYPO3-commerce] some questions

[Alex]

hi!

i have a few question about the commerce extension...

- is it possible to setup a global value for the tax (steuer) e.g. 20%?
- how could i add new input fields to the registration form, especially 
radiobuttons and so on?!

- iam trying to implement an attribut "weight" for my products. is it 
possible to realize that withe the commerce-attribut feature?! when i 
setup such an attribut it doesnt appear in the product/article options. 
is that the correct use for this feature?

i want to sum the weight of each article in the basket and in addition 
to that the delivery tax should depend on the "total weight".

it would be great if someone could field some questions

Alex