This was very helpful, so now is the time for two strategic questions.
1. I suggest to let "src:freebsd-utils" build a new binary
package "freebsd-quota". Would this naming be acceptable?
In fact, we already have also source package zfsutils (and ufsutils) [1]. The whole new source package might be reasonable for freebsd-quota.
2. Since I need to mend seven of these (only `quotaon' is flawless),
is there some subdivision of patches according to directories that
best fits the customs of this group of developers? I prefer to get
to know such practice already now in order to lessen your later
peer review labour.
See debian/patches in freebsd-utils. Cheers Petr [1] svn co svn://svn.debian.org/glibc-bsd/trunk/