Hi,
No, if you set a URL directly in the html of the description, then hikashop cannot change it dynamically. This is only possible when the "add to cart" button is generated dynamically by hikashop, and in such cases, just turning on the catalogue mode will be enough. If you enter the links manually in the description, then, you have to change them manually again.
We will add a class to the 'add to cart' html link. That way, next users will be able to hide them automatically by just adding one CSS line like this:
.hikashop_html_add_to_cart_link{display:none}
That's something you could do if you had a CSS class for each "add to cart" link you entered manually in your descriptions.