Is there any need to edit it in windows before starting the first time ? other than for the reason so that you can mine right away after boot ?
The first one I set up I edited it first the next four rigs I built I did it after. You might lose out on five minutes of mining. I burn the USB and stick it straight in the rig and turn it on. Once it is up and running I edit the 1bash (which is much easier in Linux with the highlighting) and then save it and reboot.
I had an issue one time with a bad usb image. Not sure what happened but making sure it boots with the default setup before taking the time to edit the 1bash seems like a good time saving idea to me.
The only downside is you may not have your payment addresses where you can access them on the new Linux boot up. I HATE manually typing them out and always prefer to copy and paste. With multiple rigs I just SSH to another rig and copy and paste from one 1bash to another.
Easier way is to create yor 1bash and save it to pastebin as instructed in upPASTE,
On first boot open 1bash and setup upPASTE and reboot
upPASTE will read from pastebin and update your 1bash.