I can't quite make sense of that, but you can change the behavior of mouse editing in the mouse modifier section of preferences and decide whether those edits ignore the time selection or not. You can also use a pre-roll (right click the metronome) so that Reaper always starts X-measures before the cursor position, if you get tired of doing that manually. For reference, Reaper always begins the recording at the cursor, but you can have it auto trim that to the time selection if you want by using that record mode (right click the record button).
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