You can do it via the _query
parameter of the store
directive.
E.g., the following code will generate the customer/account/create?wholesale
link:
<a href="{{store url=customer/account/create _query=wholesale}}">Wholesale</a>
In more complex cases you can use quotes. e.g., the following code will generate the customer/account/create?a=1&b=2
link::
<a href="{{store url=customer/account/create _query="a=1&b=2"}}">Test</a>