There's an additional offset I can adjust in the exheader if I want to
change the "major" version string. (the minor and micro numbers can be set using makerom/make_cia). The "version" number you see in DevMenu when you go to install this. This is important for example if you are building a game patch for use online as certain version string range is
needed to fool servers into thinking you have latest patch when going online (games that don't really use online features or never had a patch don't really need to worry about this). For games like Pokemon X/Y or ORAS for example.
You can find the offsets for stuff like this in the exheader by visiting 3DBrew.