is it possible to suppress the price if it’s 0?
no, sorry (unless you edit the template of course)
is it possible to set more than one tax
if you enter prices without tax, then no, there’s only one tax and anything else would be beyond the scope of the plugin really
having said that, if you are entering prices WITH tax, then you could just display the text as you wish (i.e something like “prices include tax at x% for a / y% for b” or something
Also the shipping should be 8%
at the moment, shipping is set as a price, rather than percent. however, i should probably be able to enable to set this as a percentage too … i will have to think about that for a bit