Actually the proposal is meant to make this harder. I haven't read the full proposal (667 pages!), but it looks like the Python program requested is to help investers do their own analysis of the risks/performance/... of asset backed securities.
From
http://www.sec.gov/rules/proposed/2010/33-9117.pdf (p 205-206)
This proposed requirement is designed to make it easier for
an investor to conduct a thorough investment analysis of the ABS offering at the time of
its initial investment decision. In addition, an investor may monitor ongoing performance
of purchased ABS by updating its investment analysis from time to time to reflect
updated asset performance.338 In this way, market participants would be able to conduct
their own evaluations of ABS and may be less dependent on the analysis of third parties
such as credit rating agencies.
The waterfall is a critical component of an ABS. Currently investors receive only
a textual description of this information in the prospectus, which may make it difficult for
them to perform a rigorous quantitative analysis of the ABS.339