It's great that you provide these options in the UI, unlike another browser that shall remain nameless (OK, Chrome).
Can you disable the cache in the UI? You could use a switch (--disk-cache-dir=null), but I'd prefer the UI method since that covers all ways that the browser opens. Setting it to 0 does not do it, while setting it to 1 keeps it pretty small (maybe up to 10MB in reality), but it's not disabled.
Cache options
Re: Cache options
Interestingly, if you do use that switch, the UI changes accordingly--in a way that's impossible to do via the UI.
Re: Cache options
Does the settingin the ui remain if you stop using the switch ?
Re: Cache options
No. If you do that the "null" disappears and files start caching.