On the "Create Bill" there is the option of "Save & add another". This would be really handy and time saving on the "Pay Bill" screen as well, if the option to "Save & pay another" were added. Along with this the "carrying forward" of the date of payment and account to be paid from would save a lot of time and effort when entering a large number of payments.
Thanks for your suggestion @KateL . I can see how this would speed up data entry. Anyone else who would like to see the option to save a supplier payment and a new one (similar to the save and add option in purchases), please cast your vote here.