Not without going through and modifying the code. When we release the next version of DT Register, items like this will be much improved. Can't say how long this will be at this point, but for now, the answer is simply no unless you want to pull it out of the code. Sorry. Hang tight and it will be improved ASAP.
The additional amount fields have been removed in the just released version 2.0! This is in preparation for the next release which will incorporate custom field capabilities.