Is the issue with scanning channels with internal S2 tuner a software issue or related to S2 tuner being low quality?
Issue is fixed! It was in amlogic hw demuxer, tuner is top quality.
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It is hoped that future versions can be used simultaneously with S2-C-T.
You have to ask tvheadend team (Jaroslav Kysela) to fix this issue. Problem is only in tvheadend, multistandard tuner has only single tuner and it is unable to use more standards concurrently (e.g EPG on dvb-t and live streaming dvb-s). Tvheadend open for every allow standard session and one of them is lucky to use tuner. Nor disabling EPG doesn't help. Internal tuner switch standard for < 300 msec.