Perhaps you could get in touch with your rough budget

carl@dcpomatic.com

I guess you mean for these ratios to be handled like DCPs, so 185 crops to 1998x1080 (in 2K) and 239 crops to 2048x858, for example?

When you say "subtitle/captions handled accordingly" you mean they should also be cropped where appropriate? (e.g. if I play a subtitled 1.85 DCP cropped to 2.39)?

i would like the (fullscreen) active area output to be croppable.
to give an example: i receive many 178 films dci-compliantly containered in 185. my non-dci-compliant monitor/projector (with native aspect ratio 178) will render these (fullscreen) scaled down (gasp!) with black borders all around. that's extremely irritating since i could render the entire active area pixel-perfect if only that dang pillarbox were cropped away.

regarding the subs/captions, another example: some silly person sent me a scope (or netflixy-aspect ratio) movie containered in letterboxed flat with the subtitles moved way up into the active area. the desired cropping should maintain the original position (if handled in percent, this might be affected if calculated relative to the cropped image dimensions) and font size (probably no issue) of the subtitles.