Default [Q] Making android-info.txt Universal

I have a question about making a universal android-info.txt for use with splash screens.

I make the M8 BIOS Splash Screens and want to make them universally flashable. I know that the MIDs and CIDs for the variants need to be included, and I have what I think is a comprehensive list of them. Many people are SuperCID anyway, so this isn't as big of a concern.

My concern is the "mainver." Can I leave it at the default value (from the splash screen creator's original android-info.txt): 1.54.401.5?

Or should I update it to be more in-line with the 4.4.3 update on the international version: 2.22.401.4?

Also, would this have any effect on flashing the zips via this command for all the variants?
Code:
fastboot flash zip splash.zip
I am on the T-Mo variant.

Thanks for any help on this!