Catch you on Discord — and thanks for understanding!
What kind of control do you use? "SimHub Control" or "SimHub Role"?
In my Hotkey action, you enter any string (like "toggle-wind") into the field "SimHub Control". There is nothing to configure in the Hotkey action about long keypress, because SimHub has its own internal detection logic for this.
Then in SimHub you open the control assignment (to stay in my example: "ShakeIt Wind", tab "Controls", "Switch wind activation"). In the dropdown, you select "LongPress", then you press the button on the Stream Deck. SimHub should change the title in this dialog to "PropertyServerPlugin.toggle-wind".
Now if you "save" and switch to the tab "Wind profile", a short press on the Stream Deck key should not alter anything, a long press should move the large toggle slider "Disabled/Enabled" in SimHub.