Unit area reclaim. Units inside the area are reclaimed if the order is given while mousing over a unit. Selected units are not reclaimed so more control is possible.
http://spring.jobjol.nl/show_file.php?id=2048 a version with those features.Personally, I'd rather just have it reclaim only the type you started the reclaim command with, unless it's an enemy unit. That is, if I click-drag-reclaim a windgen, I can drag the circle over my whole base to clear out all the windgens.
But if I click-drag-reclaim an enemy unit, I want it to reclaim all enemy units, I don't care what type.