You cant with Rog ramdisk.
I want the same and the free version of dataram ramdisk works like charm (allows just upt to 4Gb, if more are required you should bought or crack it)
Im using it as main temp folder, soy i redirected system variables.
The issue is that some files are required to be there on boot for some programs. So i installed them and i make a drive image(it requires 4Gb but being ntfs compressed the real size is the size of the files 13mb)
I had setted it up to load that image on boot always so everytghing works fine.
Also on everyboot i removed the backup of disk option to not change it with old temp files, so just load the 13mb image wich is done withount any lag.
Shutdown also doesent shows any lag.
PS: also y had complemented this with some supercache5 ramdisks for the most used drives.
i7 4770k delidded | Maximus VI Formula | 2x8Gb Gskill 2400 | HD4890 CF | NZXT 820