As I learn Pulp, I find that it's rather difficult to create modular, easy to add/edit functions that are used on a wider scale. Having arrays to store wider ranges of data with less clutter in the code would be a godsent, especially as it would, say, allow a long series of coordinate-based commands to execute in completely different places just by editing the variable the commands use as a key, or create an easy to implement lists- not to mention opening the possibility for things such as iterative commands.
Giving functions (or calls, as Pulp refers to them) optional spots for input would also help with this, to a lesser extent- allowing the input of variables in a call, which the function could then use, would make it much easier to use one function in multiple places while still storing each value (instead of overriding it with the next value needed for a different call of the same function).
Neither are strictly needed to do things you can't currently, but as an optimization/time-saving measure, having access to arrays and/or function inputs would make things a lot easier for my java-centric mind.