I may be able to answer that...At least some of the advantages...
1) INR is only tradeable against USD..As a result, not all market participants would trade in it and thus, the liquidity is much less than oder pairs.
2)Many other major currencies are interlinked...For example, many a times EUR,GBP & CHF behave in same expected fashion, while JPY behave in opposite direction.
That is, sometimes, it becomes a little easier to trade one currency based on some other currency's behaviour.
3) highest order of leverage offered.This is actually a double edged sword. It can make u big profits in small time and at the same time can wipe u out within a few trades. If a proper strategy is traded, the profit percentages are high in forex.
I am sure there must be oder advs too.
Happy Trading,
Ankit