While testing both Lohit and Utkal has hinting problems in or wp, is that possible to keep them optional? As of now automatically the default font changes to Lohit when you open or wp, instead of that is that possible to make it optional which someone can choose the dropdown?

Welcome to the club Subha. Finally we have some company :-)

We have been having the same difference of opinion with the i18n team since late october (whole story in the bug linked by srikanth). It is a POV issue as Srikanth points out. The i18n team aims to avoid the occurrence of square boxes in any of the wikiprojects using webfonts. While we feel that shouldnt occur till quality of default webfont = system font. Especially for cases like Tamil, where people with system fonts are 9-10x the number of people who see square boxes (all windows systems post XP SP2 have tamil unicode support by default and also people are very knowledgeable about font issues because of  a history of competing encoding formats)

While we still insist on the "webfont as non-default option", we are exploring both solutions Srikanth lists to arrive at the "default webfont with same quality as system font" result.  Currently the Tamil community is a) working with santosh as he tries to improve lohit tamil b) and is searching for a professional font developer to donate a good quality "webfont ready" font under OFL/GPL font exclusion.

You can try either or both of these (or request the i18n for a non-default webfont feature)

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Bala