Stable release: MacOS export overhaul; MIDI plugin; Animations Editor improvements & much more.
There are various ways to measure time in Construct. The wall clock is the time that is not impacted by the time scale. 'dt without timescaling' is obviously the same.
Usually, when people pause a game, they set the time scale to 0. The two options you mentioned won't be affected by this.
If you don't understand what time scale is, the online manuals and documentation for Construct are fantastic, check them out!