Custom sigmas support

[green-s]

Feature Idea

Many of these Turbo/Lightning models and LoRAs are trained for a specific sigma schedule. So far from LightX2V it's usually just Euler/Simple, but the recently released FLUX.2-dev-Turbo uses a custom schedule (Euler/[1.0, 0.6509, 0.4374, 0.2932, 0.1893, 0.1108, 0.0495, 0.00031]) which I don't think corresponds to one of the existing schedulers.

Either that could be added somehow, and/or a field could be added to provide custom sigmas.

ComfyUI added a ManualSigmas node last week, but this requires use of the SamplerCustom/SamplerCustomAdvanced nodes, for which SwarmUI doesn't currently appear to have equivalents.

Other

No response

[mcmonkey4eva]

It makes an extremely tiny amount of difference over default, it appears to just be flux2 scheduler with a shift? but I tossed it in under the Align-Your-Steps scheduler (which is just the magic scheduler for any model that has a special unique specific schedule recommendation)