Is there a keyboard shortcut to switch through opened tabs?

It´s indeed a good candidate! 

This was my very very first test with an "onKeyDown" Form Method. This one is only a simple test. In the end we will need a codetree solution or something similar that loads with overall Innovator (CUI init event on main header?).

const tabsObj = aras.getMainWindow().arasTabs;
const selectedTab = tabsObj.selectedTab;
const currentIndex = tabsObj.tabs.indexOf(selectedTab);

if (currentIndex === -1) return; 

let newIndex;
if (event.key === "ArrowRight") {    
    newIndex = (currentIndex + 1) % tabsObj.tabs.length;
} 
else if (event.key === "ArrowLeft") {
    newIndex = (currentIndex - 1 + tabsObj.tabs.length) % tabsObj.tabs.length;
}

const newTab = tabsObj.tabs[newIndex];
tabsObj.selectTab(newTab,true);

But this sample works well do demonstrate obstacles:

1. When mouse focus is away from the tabbar, it will not work anymore. So we need a function to set the focus to the main tabbar again.
2. Arrow keys are also used inside regular form text elements to move the cursor. So we definitely need a keyboard combination. 
3. The shown sample would never support Ctrl keys. Ctrl keys work different that regular letters. They can be "hold" for some time. That´s why they never worked in my first test. They were only triggered once.