so the real problem actually is not with the feature, but with the players present ... having the featuer or not will not change anything about the real problem.
that feature would be a usability plus which i had wished a lot before. not to maintain a stalemate line and bunker in forever, but to handle those games where 10 units are doing the work frontline, while the other 30 are essentially needed to secure borders, be it against an enemy or an ally – not forever, but maybe for the next 10 or 15 turns ...
setting those orders again and again is dull, tedious and error prone with the current interface (non-sortable, non-groupable units), and it adds no quality to the game. it can even demotivate players to play on, especially after they once made a mistake just due to the interface.
even if i don't think this feature is made for "instant stalemate orders", it's unclear to me how right now not having this feature prevents forming of stalemate lines better than when having the feature ...
if those lines are really important to a player, he will set the orders to maintain it again. he does it now (tedious) and he'd do it with that feature (not tedious). he will only not set it up failproof again next turn if he sees no need for it anymore (same/same), or if he makes an error when entering the orders (bad now, better then) or if he gets tired of that on large maps and leaves the game/site (bad now, better then).
(if one would want to escalate things, it could even be said that insisting on not having such a feature is to speculate on profiting from someone making a mistake, giving a plus to the players who invest more effort in something that has nothing to do with the essence of this game, diplomatic talks or planning moves, but only to do with clicking/typing more precisely. but i don't want to escalate things.)