You might recall this earlier exchange
I’ve also made a Keyboard Maestro palette whose commands execute various scripts that grab a link to the current note in Evernote, or a link to the current message in Mail, or link to the current document in DEVONthink as a MD link (with three flavors for this DEVONthink script: make the link an image link, or make the link open the document in the file system, or make the link open the document in DEVONthink). A final command in that palette makes an entry in DayOne with a link-back to the current selection in DEVONthink. Along the lines of the latter, I’ve begun to work with scripting for the jrnl CLI which offers more choices than the DayOne CLI.
None of this is FT of course, but MD is MD. I’ve migrated to doing nearly all my writing with MMD – and all of that with Sublime Text 2 + Marked for preview and output. (Drafts, Nebulous, and Writing Kit on iOS.) FT is too narrowly focused and special-purpose, IMO, and MMD Composer 2’s design is strange and fussy. Ulysses 3 might be interesting someday.