The Scout Mode should be used for positional and strategic advantage, but it's pointless for detecting traps/secrets. You send your Scout to check how many enemies are ahead and then you develop a strategy to defeat them with your new acquired information. How many enemies are in the area? Did we face their species before, and if so, what are their lowest defenses? Do they have any sort of special attack, like the Shades' teleport? etc.
Checking for traps and secret containers should be done by passive checks based on distance, mechanics' level, and without any penalties to the skill. The closest you are to a trap/secret, the highest your detection rate. No need to use the Scout Mode.
At the current state, it feels like this was added as a new "cool feature" and the developers want to force us to use it frequently just because they spent some time developing it, which is annoying as ****. Just because it looks cool, it doesn't mean that it's FUN to play. And if there is one thing that I learned from other games is that if a certain feature annoys most players, just fix or remove it from the game.