Radio options input – uncheck?

Hi!

I have a couple of questions regarding the radio options input.

1. I have a list of 2 additional options for the customer to add to the product. Once you click on any of these, you can’t uncheck it, hence I had to add another option called “no thanks”. Is there any way around this – to have a list of options, in which can be cleared?

2. In the same list, the customer can only choose one option. I need to be able to check both options if needed. How do I do this?

3. The options mentioned come with an additional charge. On the plugin demo page/photo it shows (+$10.00) next to the option. How do I get the plus (+) sign in front of the price?

4. Can I change the name of the option once in the cart? Instead of “Optional: Add stain & waterproofer ($5.00)” I would like to have “Optional: Stain & waterproofer (+$5).

Thanks in advance!