This has been suggested before in a sense. (Particularly for LD on big maps)
51 votes herehttps://warlight.uservoice.com/forums/77051-warlight-features/suggestions/5702941-auto-deployment-in-one-territory-bonuses-when-play
Arguably this is the same concept.. and from the community such a feature is clearly demanded.
(I believe there are some threads discussing this too, too lazy to dig for them right now . )