Nipun,
if you do not implement this, I expect you will have problems with Eclipse 3.4 and Spring IDE 2.0, as according to some earlier posts, the Spring IDE 2.0 contained in 6.5 had problems with Mylyn 3.0 (it was compatible with Mylyn 2.3 and not 3.0), and Mylyn 2.3 is not compatible with Eclipse 3.4 AFAIK but Spring IDE depends on some Mylyn integration code.
Best regards,
Robert