Maybe one of these helps:

https://www.google.gr/search?q=rss+autodiscover&sourceid=ie7&rls=com.microsoft:el:IE-Address&ie=&oe=&gfe_rd=cr&ei=8UYQVO6ABsnc8gft5IGQCQ&gws_rd=ssl

since I see at http://www.mono-software.com/Mono/Pages/Discussion/dtopic/c3elfUBjV0yNpp9qANklvg/enable-rss-feeds-in-monox-blogs/?dbmpageno=0 that Denis says about "RSS autodiscovery" being supported

he writes there: "support for RSS "autodscover" feature" (obviously a typo) and "You can find all embedded links easily (for example, on IE 9 click Tools - Feed discovery). ". Indeed in IE if one right clicks the title bar and select to see Menu bar, there is a Tools/Discover Feeds menu where you can pick the feed you want to open (also has functionality to show WebSlices in that menu, although not sure if anybody supports this IE-only [?] concept)

btw, speaking of WebSlices, I see there are extensions for Firefox etc. to support them:

http://en.wikipedia.org/wiki/Web_Slice

other links on WebSlices:

http://blogs.msdn.com/b/ie/archive/2009/03/03/create-a-dynamic-web-slice-in-5-minutes.aspx

http://windows.microsoft.com/en-us/windows/web-slices-faq#1TC=windows-7

http://msdn.microsoft.com/en-us/library/cc956158(v=vs.85).aspx

http://www.computerhope.com/tips/tip103.htm

Facebook WebSlice from IE gallery: http://www.iegallery.com/Addons/Details/7247
</br>...
</br>seems that Wikipedia website also supports such: http://en.wikipedia.org/wiki/Template:WebSlice-begin (apart from the fact that user can create their own dynamically from any site that hasn't disabled them explicitly in the HTML)
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</br>Update: collected useful links about WebSlices here: https://www.dropbox.com/sh/lphrc06i661vdv2/AACX2tZFx0Y3DIeSZXUoXoMea?dl=0

btw, I noticed that when I press DELETE button at a post, the DELETE button just disappears with no message shown in its place like "Deletion requested"

I think Panos asks if there is a ready-made widget for that (an RSS button that when you click shows a dropdown with all autodiscovered RSS links from the page, allowing you to select one to open at NEW window/tab [where you can subscribe as usual or copy-paste the URL from the address bar of that tab/window use elsewhere])

Do you have any such control in mind?

Should we implement it ourselves, is there some method we can call on MonoX (e.g. enumerating the webparts in the page and getting RSS url from each of those that are providers, or call some RSS manager class from the page context or something) to get a list / array of those RSS urls? Ideally we'd like to query some .NET object's property from ASP.net inline command to get back a list of , separated URLs (or a list/array of URLs that we can convert to a string list with some static backend method injected in the page's markup via ASP.net syntax)