Change default Image Folder

[Panarchy]

is there a way to change the default iso image folder with a script?

[FroggieTheGremlin]

ISO images can be anywhere on the DATA partition, in any folder or all folders.  VENTOY digs them out and displays them accordingly.

[GCMartin]

+1

I keep ALL my ISOs in a folder on the 1st partition named "/BOOTISOS" since starting use of VENTOY! 

Reason: ALL my ISO are centrally located and easily spotted in my search. AND, I also use a bootmanager ISO SuperGRUB2 that finds ISOs in that folder as well. Thus BOTH VENTOY and SuperGRUB2 finds and list ISOs for booting!

You are free to make your own choice.

[Algernon]

is there a way to change the default iso image folder with a script?

https://www.ventoy.net/en/plugin_control.html you can specify which folder to check for isos/img in to increase speeds for long lists and exclude looking in other folders without using a .ventoyignore files by adding global control plugin option lines to your ventoy.json like follows, just change "/ISO" to any other folder on part 1. I named mine "Catalog". 
{
    "control": [
        { "VTOY_DEFAULT_SEARCH_ROOT": "/ISO" },
    ]
}

I have seen it mentioned that some would like to boot from iso not on the usb device but instead from a computers folder but not sure if it was ever accomplished. Maybe another global control plugin can be added in the future such as "VTOY_DEFAULT_SEARCH_LOCAL_ROOT" with another starting prefix like true / or current one expanded somehow to allow specifiying a folder like /sda7/manjaro/Desktop/ventoyisofolder?