NOPE!! But they use completely standard multisig descriptors and psbts so, when used in combination with other tools that DO support SeedSigner (e.g. Sparrow), you find a way to do anything you need to do.

File it under: Proven possible, but not nearly as straightforward as a direct integration would be, and don't expect their customer support to be able to help you if you're going to opt to venture outside their necessarily more limited, more guardrailed system.