The problem description makes not clear to me why this is a problem. It describes an existing solution, and there is an easier one: middle mouse button click for new tab, normal mouse button for intab load. It is always a horror when some websites try to be smart and fuck that up (looking at you, kimono – you are great but this part of your UI is not).

Is there something special about those specific links as well that makes the existing solution not work? If not, I doubt that indicators would help much – the specific control we have already is better than the time-consuming task of interpreting those.