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Interrogation (hard one and I don't have good ideas)
As I said, hard one. In the original it felt too simple. Perhaps using word interaction would be better. Like choises how you want to approach the person: persuade, neutral, threaten, empty promises, etc...
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Neutral areas (where criminals and you and your contacts can meet, chance of ambush)
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Rural and wilderness areas (burdens programmer, but would still be nice feature)
Does everything in intelligence happen in urban areas? Why not add farm, parks, etc... And you'd actually have to walk to there to meet the guy, or trace the criminal meeting another, so you might even hear what they talk etc...
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Realistic flight schedules (or then you just have jet, but still the criminals need to use them)
Just a thought, not even a good one. Almost pointless.
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Strike team (you don't need to go alone, perhaps with specialists, adding realism, mouse command interface)
Simple. When arresting, you can give your team orders, one by one or choosing multiple guys with left button and give them go order with right? And go-commands, so you can synchronize teams assault. And general commands, such as "pull back" at least. Specialists could have for example: computer (crack the security system, dl hd), locksmith and medic (who could restore team members' health certain times).
...70 years... LOL