Hi Anthony,
We do not have support for Edge in v10 and it remains to require IE unfortunately. This is a requirement for the Astea Browser.
When you move to Alliance 15.3, this is browser agnostic and will work with Edge, etc. except for select modules which have not been moved to the Web Employee Portal (Dispatch Console, Customizer, etc.).
Alliance 15.4 was just released and has more modules moved to the Web Employee Portal but still there is a need for IE to use the Astea Browser for some modules not fully transitioned.
We do not have a solution to avoid IE at this time for v10 at all and it is still needed for the Astea Browser in version 15 where they are working on other solutions.
No, you can’t force the Astea Browser to not use IE with the method you proposed.
Phil