navigate while awaiting input

enhancement request: while awaiting input, less is stuck. it would be advantageous to be able to navigate within the data received so far while awaiting input, without interrupting the process that is supplying the data.

as it is, once i have pressed page-down, i must wait for another full page of data to be received before i may resume navigating within the data received so far, if i don't want to kill the input process.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: less 551-1ubuntu0.1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: skip
Date: Tue Aug 18 20:53:53 2020
InstallationDate: Installed on 2020-03-15 (156 days ago)
InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200314)
ProcEnviron:
 LC_TIME=en_DK.utf8
 TERM=screen
 PATH=(custom, no user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: less
UpgradeStatus: No upgrade log present (probably fresh install)