https://tcrf.net/Command_and_Conquer:_Generals#Regional_Differences Do these differences make German version the best choice for GLA campaign since there is one less mission?

Would it be a good idea to add a category that includes the tutorial missions and uses the hardest difficulty to serve as 100%?

CWC does have a campaign. DTA has a Soviet vs Nod campaign with 8 missions. There are two other campaigns and several lone wolf missions as well. There is a Code Lyoko themed mod of YR that features a RPGish campaign, much like the Yuriko campaign from Uprising. (http://en.codelyoko.fr/jeuxvideo/)

Unlike its successors, the tutorial campaign of RA2 sends you right into the Allied campaign after you beat it, and the second tutorial mission provides a rare Allies vs Allies scenario. Is it a good idea to start an Allied run from the tutorial missions?

The most widely accepted/used unofficial patches are probably the ones for TD and RA. It's hard to say how accepted the unofficial patches for RA2 are since it's not that ancient.

I photoshoped the banner of the official website into a game cover art. It's ugly, but it works :P

The engineer glitch surely helps a lot in GDI and Nod campaigns, but not so much in Scrin campaign. The only obvious benefit it offers is to capture the two GDI construction yards quickly in the first mission. Using Mastermind to teleport Assimilators is probably faster than using the glitch in mission 3.

There is a glitch that makes a mind controlled unit permanently owned by the side of the controller if you save and load when a unit is mind controlled. It's theoretically possible to get a stack of Predators and Grenadiers with this glitch and crush the GDI base without getting reinforcement in Scrin mission 2.

As mentioned in "Rules discussion", "in 1.07 the speed of the mothership has been increased by 33%." It might be necessary to time which version is the better choice for Scrin campaign since the speed of Mothership can affect the final mission a lot. The only significant advantage of version 1.0 is probably on the first mission.