Script-Fuで使える引数一覧 はコメントを受け付けていません
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0
SF-VALUE "value" "10"
SF-TOGGLE "toggle" TRUE
;初期値 50, 最小値 0, 最大値 100, small-step, large-step,
SF-ADJUSTMENT "adjustment int slider" '(50 0 100 1 10 0 0)
SF-ADJUSTMENT "adjustment float slider" '(50 0 100 1 10 1 0)
SF-ADJUSTMENT "adjustment int roll-box" '(50 0 100 1 10 0 1)
SF-ADJUSTMENT "adjustment float roll-box" '(50 0 100 1 10 1 1)
SF-FILENAME "filiname" "filiname"
SF-STRING "string" "文字列"
SF-FONT "font" "Sans"
SF-COLOR "color" '(256 0 0)
SF-OPTION "option" '("一つ目" "二つ目" "三つ目")
SF-GRADIENT "gradient" "FG to Transparent"
SF-DIRNAME "dirname" "Desktop"
実行結果がこちら。

実際に数値を入れて確かめたい方はこちらをダウンロードして使ってください。
fe-arg-sample.scm