1. If still there is another way he can file for divorce? If yes, on what grounds?
He can file divorce case on any ground mentioned in the Act. But, he will not succeed as the grounds are not genuine.
2. How long can i defer the divorce by not giving my consent (signing on the divorce papers)?
Presently, it is impossible for him to get the divorce on the grounds available at present. Hence, your deferement is not material.
3. He filed RCR in August, 2010 so legally we are not living together since August 2010, so will this period be counted for a ground of divorce if we still dont get to live together untill August 2011 (completing 1 year of not living together)?
By filing RCR, he lost the right to allege any cruel act against you earlier to August, 2010. In other words, the person, who is filing RCR is condoning cruel acts of the spouse and he is barred to raise the ground of cruelty. Do not count period. He is the person, who deserted you. He cannot be allowed to take advantage of his own illegal act.
4. My husband's family is pressurizing me stating that they would make my give divorce by having my husband marry another woman in between. If he does so will he be liable for any prosecution?
Yes. He will be liable for prosecution for bigamy. But do not wait for prosecution. If you come to know that he is going to marry, immediately move the civil coourt for permanent injunction against the marriage or otherwise move the magistrate court under DV Act for shared household, which would put a big full stop in his attempts of going for another marriage.