Taggling line 65:skk-use-candidate-window? to #f should be more graceful.
But it shows back to the first candidate
when choosing candidates more than skk-candidate-op-count,
prevents on-the-fly dictionary growing which is the major feature of SKK.
--- uim-1.9.6.origin/scm/skk-custom.scm
+++ uim-1.9.6/scm/skk-custom.scm
@@ -88,7 +88,7 @@
   (N_ "Set candidate window behavior manually")
   (N_ "long description will be here."))
 
-(define-custom 'skk-candidate-op-count 5
+(define-custom 'skk-candidate-op-count 9999
   '(skk candwin)
   '(integer 0 99)
   (N_ "Conversion key press count to show candidate window")