In anticipation of a soon to come 1.58 stable there is now 1.58 public beta (not compatible with 1.57 servers, but still installable side by side with it). As usual, grab it at http://www.arma2.com/beta-patch.php
 Changed: Manual vectoring control in autohover mode with analogue throttle using Flaps actions.
 Fixed: Helicopter did not take off when engine was off and enemies nearby.
 Improved: Faster Signature checks on server side.
 Improved: Only first AI unit in each formation reports its position on Report Status.
 Changed: First click on a target from quick commanding menu now issues Target instead of Attack, second click issues Engage.
 Improved: VerifySignatures entry in server.cfg can contain the required version of signatures.