Did you get a convincing reply for this ? See what I found:
For LLP; Stamp Duty applicable on Partnership firms would apply. (No second opinion on this) hence comparing with share capital would not help
1) As per Karnataka Stamp Act 1957 (wef from 2003; could not find if the same has changed in 2010; though there are news of reduction in stamp duty):
For Capital: [Re 1 to Rs 5000: SD of Rs 100/- ] and [For Capital of above Rs 5000: SD of Rs 1000/-]
2) So for your case it should be Rs 1000/- ; However from unconfirmed sources I have been told now that this has been reduced and applicable SD of Rs 500/-
3) In the official Kar Govt website it says Rs 100/- (Follow the link) http://karigr.org/registrationfees/regfee3136.htm#firm
Hence still a matter of confusion for me. On a safer side I might opt to go ahead with Rs 1000 to avoid understamping default.
Pls share your findings!