Cant find if there is a way to use simplify to heat bed and both extruder at once without manually doing it from the panel. Anyone have a Flashforge pro with same issue?
Yes, just edit your start script so that it doesn't stabilize the bed before heating the extruder.
Click "Edit Process Settings" and select the "FlashForge Creator Pro" profile that you need from the drop down list (use "right extruder" for right extruder only, "left extruder" for left only, or "both extruders" if you need to use both nozzles). Then click on the Scripts tab and edit the starting script so that the M104 commands come before the M134 command. This tells the bot to start heating the extruders before it waits for the nozzles to heat up.
However, note that the manufacturers specifically did NOT do this because many of the power supplies would start failing if you try to draw that much current at once.
Default configuration using RepG, delivered with FlashForge Creator Pro, is to heat them both at once. One at a time doesn't appear to be the printer manufacturer setting but a slicer setting.