[ConKbot of Doom]

program memory? No. The PIC's use a modified Harvard style data bus, seperate data pipelines for the command and for the data. So you aren't going to extend the program memory no matter how creative you get.

However with creative coding you could use an EEPROM to store data on it. and free up space that way somehow.

Or by memory do you mean ram? If that is it you can get some sram and use that for extra memory.

Or you could offload some of the work to another PIC/µC to minimize what the user processor has to do.