Alternator and Voltage Regulator Questions

Yup. With additional electric equipment the charging wire may have to do more. Whatever is done needs to be thought out.
For example with EFI, it probably makes sense to power from a fuse or breaker box off of the alternator. After all, it only runs when the engine is running. But during start up its adding a lot more load through the charge wire - which during start is the power supply wire. In turn, that means the battery recharging after start will draw more current if the alternator can supply it. Furthermore, if the new demands are higher than the wire and link can handle without resistance, there will be voltage drop and the EFI and pump may or may not tolerate that.
A different situation is a truck with an electric winch. Most alternators won't have the power to run a winch - it has to be hooked to the battery side. This is the type of situation that probably got the truck ammeter shown on MAD's website so hot the plastic distorted - high electric demands on the battery side of the gage both from the winch and then to recharge a low battery.

PS. IMO a drop of 1 to 2 Volts is way too much. Something in the order of 0.1 to 0.2 Volts would be acceptable. IIRC, that's about all the factory considered acceptable in they're advice to techs. ( It's in one of the MTSC's about diagnosing electric)