Ok... so the engineers should pickup reclamables then. Yeah, I've done this with limited success. That being said, here's why it wasn't a practical or functional mod.
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an engineer that can auto pickup or auto-assign itself tasks, could choose to ignore a task you've just given it.
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The game is really bad at this sort of thing to the point that the AI, needs map markers to know where to go. Effectively cheating, to do something we can do easily.
That being said, here are a few methods, I know "kinda" work (I tried the 1st two)
For a "Basic" automated engineer you 'd need a unit toggle, to activate independent actions. Once active the unit could randomly path around an area, and simply reclaim, what ever is nearest it.
Something a bit more complex would scan an area, make a data table of what it found. Filter through the table for reclaimables, and then sort them by distance. Then assign each of those reclaimables to itself in an order que. The limitation of this method, is that several engineers scanning large areas of the map at the same time tends to be very SIM resource intensive. Especially if there are multiple players all doing the same thing, while also building up and fighting each other.
Lastly, a UI based method could work really well, but would be crazy hard to implement. Maybe using something along the lines of a player painting / highlighting an area that is auto assigned to an engineer nearby. This would be the best approach, as the player need not zoom in, just designate an area, which is scanned, filtered, and sorted just like in the 2nd method. The BIG advantage here is that your not using up SIM resources as bad as a completely Unit based system would. Back in the day there was a UI mod that used the 2nd monitor screen as a white-board. Allowing teammates to mark up the map and draw notes for each other. Adapting that to control your engineers would be Awesome-Sauce... Unfortunately UI mods are not part of my skill set. Though, I know its possible as I've seen Domino mod a UI based map editor for FA using similar tools.
While sure, none of these methods are fully automated, your not going to have that in FA as the game engine just isn't capable of this. Even the AI uses a predetermined build table and map-based flags to setup the computer players objectives. Unless that has changed in the last 10 years...