install/59661: sysinst RFE: create /tmp with ffs vs. tmpfs, and "input units" is ignored

[sr%genyosha.net@localhost]

>Number:         59661
>Category:       install
>Synopsis:       sysinst RFE: create /tmp with ffs vs. tmpfs, and "input units" is ignored
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Sep 20 03:55:00 +0000 2025
>Originator:     Steve Rikli
>Release:        10.1
>Organization:
>Environment:
NetBSD vm09.home.genyosha.net 10.1 NetBSD 10.1 (GENERIC) #0: Mon Dec 16 13:08:11 UTC 2024  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
In some environments it can be desirable for /tmp/ to be on a traditional, and possibly persistent, filesystem. Also for systems with limited memory but plenty of diskspace, not using tmpfs may be desirable.

Today sysinst only allows creation of a /tmp/ partition as tmpfs, with no option for FFS instead.

Similarly (possibly related?), from the set sizes partitioning menu, if I "Change input units" to GB (or cylinders etc), then try to change the size of /tmp/, it still asks "Size for /tmp/ in MB?", even though the column title correctly shows the new selection.

An earlier thread where we discussed the tmpfs/ffs topic:
  https://mail-index.netbsd.org/netbsd-users/2024/08/13/msg031640.html

This is not critical since workarounds exist, e.g. creating a temporary "/tmp2" or similar during sysinst and renaming/remounting.
>How-To-Repeat:

>Fix: