My initial - some might say instinctive response - was a resounding no. This instinct was first and foremost about protecting my own interest in the form of my companies, I have bouts of inactivity and bouts where I simply don't have the muse to roleplay my corporations; I felt like this sort of system would have endangered my 'work' on them. But now I have had some more time to think about this matter and I might just have come up with something that could be interesting to everyone.
First and foremost we have to acknowledge that we cannot really compare major factions to companies. The more obvious things as 'map space' and the lack of multitudes of writers supporting the organization come to mind, but inherently... a Major faction does not belong to a single person.
They are micro-communities on their own with their own people supporting them. And when you apply for major factionship you acknowledge that there will always be the opportunity for other factions and organizations to attack you - this inherently seperates major factions from minor factions and companies.
So I'd sooner equate companies to minor factions, which have no claim to the map and often have less people backing it.
Establishing all of that... I can see two sides to the coin. Competition breeds more activity and that is a good thing for Chaos, but people (like me) don't want their stuff be wrecked, they don't always want to be competitive. As [member="Damian Starchaser"] has stated... for some companies are a viable avenue to get away from the competitive nature of major factions.
That brings me to the following idea.
Keeping in mind that is it really difficult to track all hostile actions against companies, so it would only mean additional load to the RPJs to handle this case-by-case... why don't we handle this a different way. Why don't we implement a system where 'big' corporations can lay claim to a single planet (or more) and be effectively put on the map -- maybe have it be exclusive to T6+ or even add an additional T7 that has the specific extra feature that they have enough clout to stake a claim on a system.
This way people can have their corporate war, but the corporate players will have a choice to opt in or out. Furthermore, the company owners won't be at risk of losing everything, more so losing only a single tier if they get wiped off the map.
TL;DR Proposal: T6+ Corporations can claim a world on the map, corporate wars can happen, optional. Fits with the established systems and mechanics. Allows for a new avenue of writing. Also fits with star wars canon.
Just an idea though. Suggestions, proposals, additions, editions, anyone?