So I was just thinking... It's a rare time when "1" is exactly what I want to fortify every time... It's more often "All".
Could perhaps the first "number" in the list be an "all" fortify, that moves all available troops from this territory to that. Rather than have to specify the number exactly, "ALL" would be a very convenient fortify.. Don't you think?
That's my idea... What do you think?