The thing here is: I don't see a reason for create a Bot on Bitfinex. With FRR, the people does not need Bot, they can use FRR with a negative FRR DELTA to make the "almost the best shot" of Loans.
You are probably referring to creating a loan offer with a "FRR delta" interest rate. When you do this, your loan offer will move up and down with the FRR for as long as your offer is in the lending book, however it will be a fixed rate loan once a borrower takes your offer.
I also don't think that you can auto-renew at a FRR delta without using some kind of bot. The auto-renew feature on bitfinex allows users to either auto-renew at the FRR, or at a fixed specific rate.
But my option remains: This FRR make a huge influence in the market. People use FRR with a delta of "- 2%" to make Loans.
The current FRR is 0.1147% per day, and the current lowest loan offer is 0.1067% per day. If you created a loan offer with a FRR delta of "-0.02%" [per day], then you would be creating an offer of 0.0947% per day, which is 11%
under the current low offer, and is most likely lower than you want it to be in order to maximize the interest you receive. I recently (< an hour ago) had a loan offer auto-renew at roughly 0.109% per day. If I were to place a loan offer that has $100k worth of offers ahead of me (~40 BTC), then I would place it at 0.1096% per day, or ~2.7% higher (in terms of interest received before the fees that bitfinex charges) than the current lowest offer.
That's why the ratio on Bitfinex does not suffer many variations as Poloniex does during the day, that's why the Bot works well on Polo, because it has variation of +10% during the day. Well, but once the FRR exists on Bitfinex, it can be used almost like a Bot (to make "almost the best shot" decisions)
Earlier today, the lowest loan offer was in the 0.075% per day range, according to bfxdata.com, the highest USD lending rate was 0.11880% per day over the last 24 hours. After accounting for the 15% commission that bitfinex takes, that works out to being between 1.9125% per 30 days, and 3.0294% per 30 days (both assuming that the loans remain outstanding for an entire 30 day period).