> When I go ReloadMatic settings, there is a remembered pages bloc. Is it possible to have a bloc with all reload pages and reload setting for each ?
If a lot of people would like to have it, yes.

> Is it possible to add the reload menu in the tab context menu ?
This is not possible since FF57. While I can add a context menu to tab headers, there is no way to make it dynamic like with page context menus, and even there I'm using a hacky workaround to make even that possible. So unfortunately we need to wait for Mozilla to improve the WebExtensions system first. But as soon as it become possible, I will surely add tab context menus. Promise ;)