You can actually do the mayor part of that things
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Modifier parent will be for everything nodes.
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You can duplicate with the hotkey that you want, only change the shorcut from shift D to the combo that you preffer.
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You can do macros, actually you can do with some addons or manually.
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The edge slide is similar to Alt+V Rip edges. Press G to change the way to create geometry
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Thatis true that redo operation needs a polish.