the list only works with scrollbar if you are using the desktop theme - if you use a mobile theme, the list itself can be dragged to scroll. the theme also allows you to change the color - currently however, theme customization is not available but will having said feature in the future release.
if you are referring to some delay during scroll, this may happen if the list is attempting to load items to populate the list. note that not all items are instantiated all at once - the more complex the scene (in terms of number of fields and field type), the more apparent the delay
try using mobile theme first to see if it has more to do with the interface or not
best regards
-ADMIN