Personally, I'm very glad that it is possible to use double speed while sneaking, also also while not sneaking. It's a nice feature that the IE games lacked. I fail to see how removing double speed, which would slow us down more, or splitting sneak mode into detection and sneak modes, which would not remove the need for or advantage of being in sneak mode, would improve the situation.
The point is that in the old IE games the "find/disarm trap/hidden stuff" mechanics was independent from the stealth one.