I have a fun little list on the R7RS wiki of features that seem nice to have in a record system. Some of them are from R6RS, some from SRFIs, some from Scheme implementations, some from other Lisps.
The reason I made this page is *not* because I want to put them all in R7-large, nor even that I want to consider them all for R7-large, but to show how bloated record systems can become; to show why record types are a uniquely awful part of evolving a language like Scheme.
https://codeberg.org/scheme/r7rs/wiki/Record-system-features