Up to and after this years Roskilde Festival, I've supported at least 7 different people, mostly DIY n00bs, that had trouble with this. Several which had burned of their amps in the process.
I know that the newest assembled boards have a jumper installed on the extra pin already but there's still no inlay warning that the AM mode pin HAS to be jumpered to enable class D.
Class D mode should naturally be default, so when can we expect a rev1.30 where this grievous error is corrected? So that you either have to double jumper to enable AM mode, or remove the option entirely?
Also wanted for the very very large festival stereo crowd is an on-board simple timer so that on/off and mute don't have to be turned on and off in a particular order and there's on one on/off pin that controls both on/off and mute.
The vast majority of costumers especially those that buy assembled versions are people that have little or no understanding of electronics. They can maybe solder inputs to the also, in most cases, needed line trafos but other than that their understanding of the amp is limited to being black magic, and so the boards should be geared towards being as fool-proof as possible for n00bs and then advanced users that know what they're doing can enable the functions they like.