Can the Dock bar reserve it's horizontal space even if window is maximized? I don't want to have the dock bar auto-hiding/showing, so I have it always enabled.
When I maximize a window, two things happen: 


either it goes fullscreen so it hides the dock
or I make it bigger (with any tool like snaptool etc) but it goes behind the dock , so I can't access some parts of windows (like in Chrome pages)


is it possible (is there any app) that makes the dock behave more like a windows taskbar?
If you try to make a window bigger than the size left by the Dock, by dragging the bottom of a window yourself, you will notice that you can't do it. This is because the Dock already behaves like a Windows Taskbar: you can move windows behind it but not resize windows beyond it.

The problem lies with the tool that you are using to resize the window-it is extending the window more than it should do. Try using a different tool to do the resizing or resize the windows yourself.