Add property allowing the developer to define the maximum count of the items which can be shown in the drop-down without scrolling. For example, it the current items are 2, show no scrollbar (even if menu's DefaultGroupSettings.Height = 300px), but if the item are more than 10, use the set scrolling height.

Currently, as mobile browsers scroll bars are transparent and initially not visible, there is no indication to suggest to users that a mobile RadMenu can be scrolled down to see items not currently displayed.
The suggestion it to add a mobile RadMenu visual indicator which shows to users that there are more items to be seen on scrolling the menu. It would enable customers to set a mobile RadMenu height that does not fit all items, and indicate to users that the expanded menu is scrollable.

The default behavior of the mobile menu is the following: when popup with root items is opened, its height is calculated depend on root items count and their height. After opening a sub-menu, where items count is different, the popup height is not updated.

The suggestion is to add a functionality to popup menu to update its height every time after opening a next item.

Currently the Menu with RenderMode="Mobile" expands only in one direction(down) and disregarding the value of the  DefaultGroupSettings-ExpandDirection property.