For the first idea, you'll need to see the difference between your soldiers and enemy humans somehow. Also it will be a rather challenging mod to implement, if you look at it from a developers perspective.
The second one is a bit easier, but there is an issue with the civilian sprites, because they can not carry a weapon in an elegant way
It would just "stick" to their body.
Also you say "after version 1.0" , but OpenXcom after 1.0 will always stay vanilla
: a base for mods people develop in their own repository. You can not really say this is a minor enhancement to the game you can easely switch on/off
This would be more fit for the chocolate
or the stracciatella