I am guessing one reason why LyX is able to copy and paste cells or tables while retaining the distinction between text and math cells or math within a cell has to do with clipboard locales.
My understanding is that the clipboard might retain the copied content in different formats. http://msdn.microsoft.com/en-us/library/ms649013%28VS.85%29.aspx So my question might be, is there a way of generating a string which can be pasted into LyX where math mode is recognized and applied? For instance, is there a way to paste the string "The result is $\beta=2$." into LyX where LyX automatically knows to use math mode for $\beta=2$ and not simply paste is as a string? Thanks, Ken