Dear Bkm,
Absolutely no problem in using more than one signature, which means one for banking, important documents like agreements, contracts,deeds etc. which is not used very often and for a limited occasions. And use similar or shorter versions for all and sundry uses. It's nothing unusual about it. Almost everyone use a shorter sign like putting initials in attendance regr. or vouchers, log book etc.Similarly signing in their vernacular, like some state govt. employees and English signature for documents is also in vogue. In Central govt.,offices, central PSUs, autonomus establishments supported by central govt. signing in Hindi is encouraged, you may be surprised to know this, for every signature in Hindi they are paid some incentives in cash also, 'earn while you sign', even some state govts might have such scheme while a few state govts issued directives to sign files/correspondences only in such state language. But, caution, if you start signing on day to day basis, like one style today, tomorrow another another style, or too many diff.signatures one may land in trouble too. So restrict to two, say a shorter version and the other an authentic version failing which you may run into the risk of proving yourself, "who are you" as the genuine signature is your identity too. It's normal one's signature undergo changes as the years passes by. For e.g. one's sign in the SSLC certificate would 100 % vary with a sign. when he/she gets into the college or employment and when become older. Now a days most/all banks got online verification of specimen signature. With slightest variation in sign with the specimen banks/post offices will ask you to submit ID/sign proof attested by a Gazetted Officer, and they are right too. (I don't know what the GOs will do if their own sign.doesn't match with their own original sign.)
kumar.s.