1) The Saver Day Pass covers almost all public transport including Panorama Express trains (seat reservation obligation & fees may apply). Limitations are with mountain transport, cable ways, etc. See the validity map here (see download link in section Downloads):
2) As mentioned, for some PE trains, such as Glacier Express, an additional seat reservation is required. No seat reservation in IC, IR, R, S-Bahn, etc. trains required.
3) Yes. I don't understand why you think it would make a different.
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