I have waited long for this (and probably other people even longer), but finally my request was (partially) granted and there have been added 6 additional aspect ratios in the civitai generator for SDXL based models (SDXL, PonyXL, IllustriousXL, NoobAI-XL).
I just generated this onsite
These are the typical SDXL training bucket ratios, that I use for precropping images for training.
Update (2nd October): The new aspect ratios are now available for a bunch of other models including Zimage, Flux.1, Flux.2, Flux.2-Klein, Anima, Boogu, Ideogram 4 and others previously limited to only 3 aspect ratios. A PR for custom aspect ratios with 32px steps is on the way.