An Int32 value is a numeric value, positiv or negative, with no decimal places: it is an integer, or integral value.
Many of the values you give are integer values, e.g. 0, 1, 25, 50, or 100. In particular, indexes (e.g. the number of the page, or the playback thereof), user numbers, or IDs (if numeric) ar usually Int32 values.
As soon as a division comes into play, the number format will inherently change a floating point value such as Single, e.g.
<step>ActionScript.SetProperty.Float("Playbacks.Editor.Times.ChaseSpeed", Playbacks.Editor.Times.ChaseSpeed / 2)</step>