Optional Longer Readback for Continuity (with warning for high credit usage?)

I was wondering if there is any possibility of getting the draft feature to have an option to uncap the 20k word readback for continuity, and instead read as far back as it can with a warning or something to alert that it will have very high credit cost? I’m just really interested in seeing how the AI could handle reading back my entire book as a I try to write it, as my individual chapters are sometimes 15k words long and using a TON of credits at once isn’t a concern for me. (I don’t know much about the AI though, so I didn’t know if the 20k limit was a hard limit or not on the tech side, so I figured I’d ask.)