Just copy and paste the menu entry inside main_menu.cfg from 18.10 into 19.10, extract your Mini Windows 10 ISO onto the root of the USB, and that should be all there is to it.
Thanks for your suggestion. But I encounter some issue here:
1. I build USB key via medicat_v19.10.stable.iso
2. I unpack medicat mini.windows.10_v19.10.iso and copy anything to the USB key
3. I copy the section of "menu label Mini Windows 10 + Recovery" from v18.10 main_menu.cfg to the one in v19.10
4. I found when ever I hit enter to "Mini Windows 10 + Recovery" it went directly into win10 build
5. I also found out the same with menu item "Windows Recovery (7, 8.1, 10)"
In fact I found both 2 menu call out same command:
APPEND --config-file="find --set-root /Win10PE.cd; chainloader /bootmgr"
6. If I restore \boot to the one from medicat_v19.10.stable.iso
Both above menu item call for "Windows Recovery (7, 8.1, 10)""
7. After some try, I found the file "BCD" in \boot is controlling this.
However, I do not know how to modify this BCD file so I can get back min win 10+ Win recovery 7,8,10.
BCD from min win10:
================
Entry #1
Name: Win10PESE x64
BCD ID: {default}
Device: [boot]\sources\boot.wim
Bootloader Path: \windows\system32\boot\winload.exe
Windows Boot Manager
--------------------
identifier {9dea862c-5cdd-4e70-acc1-f32b344d4795}
description Windows Boot Manager
locale en-US
inherit {7ea2e1ac-2e61-4728-aaa3-896d9d0a9f0e}
default {7619dcc9-fafe-11d9-b411-000476eba25f}
displayorder {7619dcc9-fafe-11d9-b411-000476eba25f}
toolsdisplayorder {b2721d73-1db4-4c62-bf78-c548a880142d}
timeout 10
Windows Boot Loader
-------------------
identifier {7619dcc9-fafe-11d9-b411-000476eba25f}
device ramdisk=[boot]\sources\boot.wim,{7619dcc8-fafe-11d9-b411-000476eba25f}
path \windows\system32\boot\winload.exe
description Win10PESE x64
locale en-US
loadoptions DISABLE_INTEGRITY_CHECKS
inherit {6efb52bf-1766-41db-a6b3-0ee5eff72bd7}
nointegritychecks Yes
osdevice ramdisk=[boot]\sources\boot.wim,{7619dcc8-fafe-11d9-b411-000476eba25f}
systemroot \windows
bootmenupolicy Legacy
detecthal Yes
winpe Yes
BCD file from medicat_v19.10.stable:
============================
Entry #1
Name: Win 10 Recovery ==>
BCD ID: {0bfdc1c7-db30-11e7-bbf8-408d5c8da53c}
Device: [boot]\recovery\10\sources\boot.wim
Bootloader Path: \windows\system32\boot\winload.exe
Entry #2
Name: Win 8 Recovery ==>
BCD ID: {25571ef1-db33-11e7-bbf8-408d5c8da53c}
Device: [boot]\recovery\8\sources\boot.wim
Bootloader Path: \windows\system32\boot\winload.exe
Entry #3
Name: Win 7 Recovery ==>
BCD ID: {b8bc9a3e-db32-11e7-bbf8-408d5c8da53c}
Device: [boot]\recovery\7\sources\boot.wim
Bootloader Path: \windows\system32\boot\winload.exe
Appreciate if you can show me how to do it. I have no ideal on how to merge the 2 BCD file into one.