What terminals of bridge rectifier to use, if I want it to behave as a high-current diode?
Think of the schematic of your bridge rectifier as 4 diodes







simulate this circuit &ndash; Schematic created using CircuitLab

You have multiple options:


Use AC1 as Anode of D1 and Pos as Cathode of D1
Use AC2 as Anode of D2 and Pos as Cathode of D2
Use Neg as Anode of D3 or D4 and use AC1 or AC2 to select either D3 or D4
Connect AC1 and AC2 together as the anodes of D1/D2 in parallel and Pos as the cathode D1/D2
Connect AC1 and AC2 together as the cathodes of D3/D4 in parallel and Neg as the anode of D3/D4


In 4) and 5) above the diode pairs won't match perfectly, but you'd probably be able to achieve 1.5-1.6 of the rating of a single diode and achieve a lower Vf using the parallel diode pair. Within a bridge rectifier, the diodes will all be at roughly the same temperature, especially for the pairs with anode and terminal bonded together.  

I left off the option to use Neg/Pos as a diode serial/parallel pair as this is not a good option.