[-=*Raz0r*=-]

ITEM_TYPE_LISTBOX elements (Server browser, hilt selection, etc) can't be scrolled.
Whether you consider this a bug or not is totally your call. I like to scroll through lists

ui_shared.c -> Item_ListBox_HandleKey

After

			if ( key == A_CURSOR_DOWN || key == A_KP_2 ) 
			{
				if (!listPtr->notselectable) {
					listPtr->cursorPos++;
					if (listPtr->cursorPos < listPtr->startPos) {
						listPtr->startPos = listPtr->cursorPos;
//JLF
#ifndef _XBOX
						return qfalse;
#endif
					}
					if (listPtr->cursorPos >= count) {
						listPtr->cursorPos = count-1;
						return qfalse;
					}
					if (listPtr->cursorPos >= listPtr->startPos + viewmax) {
						listPtr->startPos = listPtr->cursorPos - viewmax + 1;
					}
					item->cursorPos = listPtr->cursorPos;
					DC->feederSelection(item->special, item->cursorPos, NULL);
				}
				else {
					listPtr->startPos++;
					if (listPtr->startPos > max)
						listPtr->startPos = max;
				}
				return qtrue;
			}

Add

			if ( key == A_MWHEELUP ) 
			{
				listPtr->startPos -= ((int)item->special == FEEDER_Q3HEADS) ? viewmax : 1;
				if (listPtr->startPos < 0)
				{
					listPtr->startPos = 0;
					Display_MouseMove(NULL, DC->cursorx, DC->cursory);
					return qfalse;
				}
				Display_MouseMove(NULL, DC->cursorx, DC->cursory);
				return qtrue;
			}
			if ( key == A_MWHEELDOWN ) 
			{
				listPtr->startPos += ((int)item->special == FEEDER_Q3HEADS) ? viewmax : 1;
				if (listPtr->startPos > max)
				{
					listPtr->startPos = max;
					Display_MouseMove(NULL, DC->cursorx, DC->cursory);
					return qfalse;
				}
				Display_MouseMove(NULL, DC->cursorx, DC->cursory);
				return qtrue;
			}

Updated: Fixed for FEEDER_Q3HEADS to skip an entire row (16th October 2011)
Updated: return qfalse if there's no more to scroll, to prevent the sound from playing (10th November 2011)
Updated: Forcefully update the mouse position when scrolling so the proper listbox entry has focus (12th November 2011)