B2. Was not able to cast blizzard due to my units presence in casting region. Even not able to bypass this cast and finally was forced to apply auto play mode. I really want to be able to cast even if my units die - don't care, it was final battle and game was already won.
The other mouse button should cancel the cast - after asking for confirmation.
B3. ALT+TAB doesn't work as expected like in other games. The game is not minimized and shows on after moving focus to other window.
That's because FE always runs in a window. If you set the resolution to "Desktop", it paints over the window border, but it's still an almost normal desktop window.
I like it because with two monitors it means I can easily move in&out of the game.
Even if you don't like it, its only an annoyance, not a bug - the game doesn't crash, and the other windows are not negatively impacted by FE behind them.
BTW, <Windows>+<D> does "Show Desktop", which minimzes all windows including FE. After that you can un-minimize only the windows you wnat to see.
B4. Crashes after 5+ hours in game. Reload last save helps.
FE is still leaking some memory, most of it with save&load. A large, fully visible map seems to need about 0.8GB RAM, and each loading needs another 0.3GB or so.
A warning sign for an imminent crash is when you don't see water after loading (only the "ocean floor").
Otherwise it rarely crashes (at least for me).
B5. Deleting unit/building from city build queue doesn't return allocated resources (allocated when adding it to queue). The resources are wasted.
I'd consider this an annoyance: It may be a conscious designed decision.
A8. Can't build roads. Why?. I want waste my pioneer time just to build my roads. Pleeaassee. Building roads using outpost don't help either and outposts are connected to road in unpredictable way and my final outpost which shall connect road_A and roadB does't do it.
Get a hero with path of the governor, and level him until he gets it (someone has it from the start).
Or play a custom faction with Mancer blood (from Workshop). The description popup doesn't tell they can build roads
but it's mentioned in the wiki.
Q1. How to remove FOW? After finishing a game I would like to know what other monsters are present.
Google the cheat keys and how to enable them.
Your annoyances with movement and road building are classics - your choice if
or 
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Edit: And I see the multiple quoting is as wonky as ever 