I have it printing! Nice and sweet...

I created a macro (PrintInCopyMode)

M563 P2 D0:1 H1:2 X0:3 F1:1 ; tool 2 uses both extruders and hot end heaters, maps X to both X and U, and uses both print cooling fans
G10 P2 X0 Y0 U-150 S0 R0 ; set tool offsets and temperatures for tool 2
M567 P2 E1:1 ; set mix ratio 100% on both extruders

I have Tool 0, 1 and then the new one here... Is it possible to delete T0 and 1 before? So i could switch between both modes...

Edit:

Found it:

M563 P0 D-1 H-1

M563 P1 D-1 H-1

So a Macro with:

M563 P0 D-1 H-1
M563 P1 D-1 H-1
M563 P0 D0:1 H1:2 X0:3 F1:1 S"CopyMode"; tool 2 uses both extruders and hot end heaters, maps X to both X and U, and uses both print cooling fans
G10 P0 X0 Y0 U-150 S0 R0 ; set tool offsets and temperatures for tool 2
M567 P0 E1:1 ; set mix ratio 100% on both extruders

would create just the CopyTool with a click on this macro... Vice Versa from CopyMode to normal...

M563 P0 D-1 H-1
M563 P1 D-1 H-1
M563 P2 D-1 H-1
M563 P3 D-1 H-1
M563 P0 D1 H1 F0 S"E1" ; Tool0 uses Extruder0, Heater1 and Fan0
M563 P1 D0 H2 X0 F2 S"E2" ; Tool1 uses Extruder1, Heater2 and Fan2. X-axis is mapped to U
G10 P0 X0 Y0 Z0 R0 S0 ; Set Tool0 axis offsets and temperatures
G10 P1 X0 Y0 Z0 R0 S0 ; Set Tool1 axis offsets and temperatures

Works as it should... Nice!