That is indeed another one of those very specific use cases

. Just keep in mind that the battery life will of course suffer from this.
There's a button that does the trick in the KUAL helper extension ("PREVENT Screensaver") (which implies jailbreaking the device, cf. the Dev corner).
On a vanilla device, there's a way to achieve the same thing by 'searching' for a specific string in the searchbar of the Homescreen (
~ds).
On a sidenote, this isn't a permanent change, if the device is rebooted, the screensavers will be enabled again.
FYI, the default 'timeout' is 15min, if you want to know the exact timing to check whether this works

.