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Without code changes there is no way that I can see to properly optimise scanning.

You will have to scan once for each channel and be sure to include the following "global" PIDs: PAT, CAT, SDT, NIT and EIT. Required channel PIDs would be PMT, EMM, ECM, video PIDs, audio PIDs and subtitle PIDs. This scheme would not work for channels which change PIDs.

But you could remove the PID filter completely (pids=all).