Hi DanielBrayn to MDL at your service; but when you want post something related to gaming you need go to correct section right dude
I do have Windows 7 LP's in EXE format and so first I need to convert them to CAB and then will upload it with the other files required for Integration.
You need to capture the Packages removed from the original image using the SxSExpand tool and then integrate the captured packages.
For what exactly is index 1 (Windows PE) in boot.wim? Can I remove this index? The goal is to make the process of integrating updates and cleanup resetbase faster.
It's the pre-installation environment. And yeah it can be removed, but you will not be able to boot into it to troubleshoot (though you can still use a WinPE boot USB/CD). I always remove the default PE environment and add my own custom WinPE that has all my imaging, backup, deployment, etc. tools integrated into it.
Could MSMG add the option to Apply/Save the image WITHOUT performing CleanUp or at least without performing CleanUp with ResetBase?
That's WinRE (Windows Recovery), which is a derivative of WinPE. I personally also get rid of that also, using the Microsoft-Windows-WinRE-RecoveryAgent WSIM pass and setting the UninstallWindowRE to true. It's very easy to either create your own custom WinPE that has all the tools you want, place it in its own small disk partition and then add it to your boot menu.
Here are a few screens of my own Win10PE I use in place of Windows' default WinPE and WinRE. I put it on its own partition on a non-boot drive and add it to the boot menu. That way, if anything were to happen to the main C-drive, I can still enter my WinPE and either restore a backup or fix whatever the issue is on the C-Drive. You can also add the custom boot.wim to the sources folder of any installation media - overwriting the default boot.wim - and add that to its own partition or drive. Then you can auto-boot right into the custom PE and run setup.exe to re-install you custom install.wim
^^ well you don't need wait for next version of Toolkit dude, after fresh install is simple using Dism to install NETFX3
but in that case, one shouldn't integrate any Windows updates. it's best to just remove the bloatware, then use the DISM Command to integrate the .NET Framework 3.5, then install the latest Windows updates manually right?