These 2 islands are of a great significance and interest to India, but it seems there is something substantial that we are looking to negotiate than just the 2 islands. The whole taxation treaty is a little over blown from India's PoV, though that is being used as a bargaining chip by the Indian side, and the Mauritians do understand it, so they should come up with a better deal.
India has developed a strong presence in the region (west Asia/Africa) economically and militarily, and it is extremely important that we have a permanent naval base in this region which today accounts for 25% (200[+]b usd) of the total trade we do. One has to just look at the exponential growth of trade between India and Africa which has grown from a billion dollars in 2001 to 62b usd in '11 and the target is to make it 90b usd by '15, and India sees Africa as a long term investment destination, and geography and history are on our side here.
This region, the arc, starting from Africa to SEA is of great strategic value to India and as we grow, we do see it as an extension of our legitimate interests. What we have done in the SEA is remarkable and even more so because we have achieved it without much fanfare or eyebrows raised, mind you the game we were playing there wasn't so much about the SCS though it did seem to be so, similarly the huge push to Indian interests in WA and Africa is no less an achievement especially when at one point of time it seemed to be a Chinese onslaught, but it has been corrected to a large extent.
There should be no doubt in the fact that India has ambitions of being the big player and play the bigger games, but all that comes later, for now the immediate concern is to take care of the country's interests and if it means going beyond the borders, we have just started doing that, and the good thing, all this is happening without raising any alarms.