Unfortunate my original question is gone while editing this post...
I was asking if it was possible to place a centered marker, without the directions to/from it.
This sounds a bit strange, but in this case you can't get to the main destination by driving, only by foot/bicycle. So I want this to be clickable for the pop-up bubble, but not for the directions.
Edit:
In css I've put:
select#select_from option:nth-child(4) {display:none;}
select#select_to option:nth-child(4) {display:none;}
and this is working.
Now the marker is still visible (and centered) but you can't select this point as a source or destination to get directions from or to.
Is this the correct way, or is there a better way to achieve this?