Hello,
1) Modem firmware is developed by Quectel/Meiglink, depending on the module used within the device, not by Teltonika. For one, many modem firmware related details are not disclosed publicly. Most relevant changes are implemented in router's firmware and that is what you should always keep up to date. Modem firmware update is suggested under Teltonika engineer's supervision. Otherwise, it should be left as is.
2) Have replicated the issue. Thank you for pointing this out. It will be forwarded to the developers.
3) Also replicated. Will consult, whether this is intended or not. Are keyboard shortcuts not convenient for you?
Best regards,