It is already supported. Please go to "manage" subscriptions (tap the button in the bottom left corner) and change open method for all feeds or individual feeds.
Changes are always immediately uploaded to the server. Unless you're using the app with no network (offline mode).
@Joseph-Wilfried It could be implemented but the lists performance is impacted on Surface RT. We'll consider it after the Windows 8.1 update.
6 votesAdminngreader (developer, Next Matters) responded
Please use Ctrl+Shift+D shortcut to disable/enable shortcuts before typing comments in a webpage.
Shortcut updated to Ctrl + D. Currently auto-detecting form fields is not possible.
1 voteAdminngreader (developer, Next Matters) shared this idea ·
132 votesAdminngreader (developer, Next Matters) responded
Not possible due to OS restrictions. Will consider in future update.