I created a dirty fix to start the Plop Boot Manager from the FreeLdr Boot Menu. I will add it to the download section when its tested by someone else.
I had some troubles with installing ReactOS in virtual machines (qemu and Virtualbox). At first, I would say, ReactOS should remove the install option from the Live CD. The error message "Userinit failed to start the installer!" is not helpful. It would be better to tell the user, that this CD can't be used for installing ReactOS. And the second problem was, after installing ReactOS from the correct CD, I got a blue screen. The debug log told me "hive header failed". Hmmm. After installing a few times, finally the problem was that the virtual hard disk was too small. I can't remember, that I have seen an error message about that during the install process. Booting worked fine with a hard disk of 5 GB. Later, I saw the disk had about 2 GB of data stored. Previous, my virtual hard disk was only 500 MB big. I don't want to register to the ReactOS forum because of those few problems, and maybe those are my faults. Now its here documented. Ok, ReactOS boots.
The patch:
https://download.plop.at/files/bootmngr/plpbt4win-freeldr-patch.zipPatch instructions:
1) Run the batch script "01-freeldr-patch1.bat". This creates the file "c:\boot.ini".
2) Run "InstallToBootMenu.bat" from the Plop Boot Manager "Windows" directory.
3) Run the batch script "02-freeldr-patch2.bat". This creates the file "c:\plop\plpfreeldr.ldr".
4) Open "c:\freeldr.ini" with an editor.
5) Add in the "[Operating Systems]" section the line
PlopBootManager="Plop Boot Manager"
6) Add at the end of the file the lines
[PlopBootManager]
BootType=BootSector
BootDrive=0
BootPartition=1
BootSectorFile=\plop\plpfreeldr.ldr
7) Save the freeldr.ini file.

Optional, if you want, you can remove the dummy file "c:\boot.ini".
Then reboot.
Note: Native loading of the new boot manager from FreeLdr is still on the todo list.
Best regards
Elmar