I have transactions coming in with large derivation gaps like 12, 45, 60, … which Trezor Suite is not picking up on. Can I force a scan to a particular index or set the lookahead to a higher number within Trezor Suite?
this is not supported in Trezor Suite. you will need to use some 3rd party wallet where the gap limit is configurable.
For instance, Electrum Wallet.