The reason I though that was because it leas one scenaario had them arrive randomly, and (I think) two of them have them start in the middle, with two zones, one behind the other, and it could be that the spearmen end up in front of the divider, and the Reavers end up behind it, and it would tae a turn to rearrange them once the battle starts.
In To The Death you deploy front on 1-3 and anywhere on 4-6, so effectively on 1-6 you set up in the front with reavers in the front rank. Recon I guess might be different, but you don't have to rush forward from turn one, there's nothing wrong with waiting for a turn or 2 for everything to arrive.
Taskmasters imho are not too useful. they effectively increase your Might by half, but with the current rules you end up with 4+ bands per army and a total of 10+ Might in many cases, so there's no need for that.
As for Shade I think he's pretty crucial for a Reaver front rank because when you're fighting Elves with a 3A vs 2A you have roughly 60/40 chance of winning while with a Shade you're up to 70/30. You really don't want to be losing Reavers. When fighting anything under F5 normally you have a 72/28 wins ratio and with a Shade you get up to staggering 87% of won combats. If you were to stick a banner in somehow (or a Bosun, or even better Dark Marshal for extra anti-hero support) you're going up to 92%. Reavers with Shade are the new black Note on Goblins benefit from the Shade: 2v2 combat against everything with higher Fight is just 39/61, while with a Shade is 61/39. Shade for Goblins is effectively giving them F10 against all non-heroes. Shade for Reavers gives them a bonus on top of F10 because they start with F5