I love to play GW2 on the Deck. Some of the vertical maps like HoT maps and Arborstone can be a little bit anyoing due to 20 to 30 FPS only though. 😞
I was one of the early adopters and created my personal controller mapping which was inspired by the official mapping of Elder Scrolls Online. It uses Action Mode Camera, the only big drawback is the game deciding in some occasions to turn action mode on and off for you. So you also have to hit the select button on the steam deck to turn action cam on again.
Link:
Deck GW2 Ultimate Pro V10.11
steam://controllerconfig/4058217053/3008859672
How to use:
Then you login with character first hit select button to turn on Action Cam. Holding down the left trigger L2 activates the mouse/menu mode. During this mode left Trackpads turns into Touch Menu for TradingPost, Inventory, etc... right Trackpad turns into normal laptop mouse trackpad. Move the Cursor and press to click. R1 and L1 are optional left and right click, then the trackpad is to sensitive.
It also supports gyro while trackpad or stick is touched which eases placing AoE-fields. I also spent a lot of time in the targeting.
Left Trackpad is reserved for mounts and showing all names of NPCs
right trackpad for Class features F1 to F4
Click the left Stick to evade in any direction
R4 Grib to interact and talk to NPCs
hold slightly right stick or trackpad and move your deck arround to look arroun in game.
Skill Rotation from skillbar 1 - 10: R2 (Auto Attack), X, Y, B, L1, R1 (Heal), L5, R5, L4, Double click R4 (Ultimate)
To Target a Skill with GYRO or right stick, press and hold the key.