thanks.

There is no real reason to have different color schemes. 

Your proposal will create big problems for all users.

Font size saved on layout.

Font size must be save on layout. We wiil check this.

But colors settings - not. Because as usually users want have same colors for all layouts.

Please ask google. heatmap it is standart features.

Do you have name of this line on others planform on english? May be it is VWAP?