Have to agree, would be nice to have 50% effect d/s at npc, so ppl who wants to go hard having supports will be still a big benefit and casual players would be satisfied as well.
Wind walk/berseker buffs doesn't gives extra speed for Elemental summoner summons (most probably for other class summons too).
Added to fix list
It is only visualy wrong displaying. Actually ww/berserker give extra speed, but it is not displayed. We will try to fix it asap.