The extension does it's job and very well and I wholly agree with you that there should be way to customise icon locations as many inferior browsers do offer this option. As a long standing former user of Vivaldi (which has lost its way since version 3.7 and being totally dismissive of Edge) I miss that as you do get used to layouts and a change takes a lot of getting used to, kind of puts you out of your comfort zone for a while.
Please Opera at least offer customisation. We can live with the homepage extension - for now.

@scyllo Have you tried using RegisterFirefoxPortable. You can use this for Opera installed or portable.

http://www.winhelponline.com/blog/register-firefox-portable-with-default-programs'
for example to make launcher.exe install (as) the default browser.
The description in Default Apps/Programs in Windows will say "Mozilla Firefox, Portable Edition", but you can change that by editing it in

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\FirefoxPortable\Capabilities" in the registry.

The extension does it's job and very well and I wholly agree with you that there should be way to customise icon locations as many inferior browsers do offer this option. As a long standing former user of Vivaldi (which has lost its way since version 3.7 and being totally dismissive of Edge) I miss that as you do get used to layouts and a change takes a lot of getting used to, kind of puts you out of your comfort zone for a while.
Please Opera at least offer customisation. We can live with the homepage extension - for now.

Find 'Homepage in New Tab' in web store. You can configure the extension to set a home page icon on your toolbar.
Pin the extension to the bar and click the icon to open it and paste your home page URL into the box. Do not close the tab but go back to the icon and click again to set your homepage. Check reuse in options and it works.