I never used the Betfair app, but in iBetMate you can do the normal method in Betfair site. Submit a bet of 2 with odd 1.01. Then, edit the bet and change the value to 3. After that, you will get 2 different bets with odd 1.01. Just edit the bet with value 1 with the odd that you pretend. Unfortunely, in iBetMate isn't possible to choose any other value than 1.
I never used the Betfair app, but in iBetMate you can do the normal method in Betfair site. Submit a bet of 2 with odd 1.01. Then, edit the bet and change the value to 3. After that, you will get 2 different bets with odd 1.01. Just edit the bet with