PPPoE IA is not supported on ME-3600.Where did you see the support document which mentions you can configure it on ME-3600 ?

You can use following options. •Queuing (queue-limit)  •Scheduling (bandwidth, priority, and shape average) The link i have provided, documents the configurations in detail.

Nopes, its not supported.http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/12.2_52_ey/configuration/guide/swqos.html#wp1089142"Output policies do not support marking or policing"

I Agree with your point, these statements are confusing, and should be made simple.- PW is not supported if your core facing interface is SVI. or if your remote PW Peer is reachable through MPLS-Enabled SVI interface.- 62 OIFs Mean "Maximum Outgoing ...

You can find the difference from feature navigator, the only difference is architecture and platform limitations, but they depend on feature wise.