In my opinion two features that would really improve the productivity of using the PBP compiler would be:
1) Making it one of the supported compilers that would work with Proteus VSM schematic capture and simulation tools;
2) Making the PBP compiler truly compatible with Windows 7 64 bit computers....I have not yet been able to get my PBP 2.6 compiler to work with Windows 7 on my 64 bit machine.
3) In the interest of an integrated solution, ensure that an integrated package of PBP, MSAM, FineLine, and MPLAB will all work as a more integrated combintation on Windows 7 64 bit machines.