EAS drivers are qual'd on two types. Typically is Phenom 100 and Phenom 300 or KA 350 and KA 90. There is some mixing between the KA's, Phenom's and CJ.

I personally now fly the Legacy, Phenom 300, KA C90 and a Cirrus for my job. I am paid per the highest salary for the largest airframe, so that we get a bit extra for the extra load. We are about to reduce to 3 airframes per person. I find that I will always maintain professional proficiency in all jets (2 is my max) and a competent efficiency in turboprops or else. Meaning, I will have all limitations, memory items and systems knowledge in my feeble noggin. For the tp's and recips....i will know basic knowledge and how to unscrew what has happened when needed.

On the per diem vs company card. You ask 10 people this question and you're likely to get 13 answers.
From my experience of both sides, guys on a per diem will start hoarding the per diem money and haul lunch boxes or eat crap. Some won't, but they aren't the majority.
As for the company card, yes...you have the 15,15,30 limits, but 90% of the time you don't have a problem unless you buy booze, you like to eat like a king or are in NYC.
I have always defended the "You can't always eat for the 15,15,30 limits in all cities". When you out of the US or major metro cities (NYC type places) you can't always eat on that budget.

On the pay scale issue. EAS has given raises every year for as long as I have known. When you don't have a set pay scale, this gives the freedom to give more when they have more to give. If you set a defined raise schedule, you will only get what the schedule allows.
The set pay scale only allows one to know or plan on what he will make down range.

Would this set pay scale make a difference in your desire or lack there of to stay at EAS?