I would like to be able to adjust various parameters for more components that have various specifications. The 555 is a great example. There is the LM555, NE555, LMS555 and TS555 which are low power CMOS. Rather than adding all these flavors, being able to adjust parameters such as minimum input voltages, rates current draws, etc, to allow us to get more accurate simulations. I'm prototyping with a LM555, but will be using a much lower power TS555. It allows for a 2v input, where as I can't go below 5v in Crumb because the LM555 has a 5v minimum. Not sure what other components will benefit from this.