@dan-donoghue Currently, Skraper replace the following varables:
%ROMROOTFOLDER% : The selected root folder you selected in the wizard.
%FRONTENDROOTFOLDER% : Selected front-end path in the wizard (only for Retropie & Launchbox).
%SCREENSCRAPERPLATFORM% : Internal ScreenScraper system name.

There is no variable for recalbox (or any other frontend) that map recalbox system folders. Actually those folders are hardcoded in the wizard (for ES-based front-ends)