Hi,:
1 There is no more Research Master. Now there are two options. If you already have a MSc. you can apply directly to the PhD, and the first year you will have the second year of the Research Master, a.k.a. Macro, Micro, Econometrics and Math. I have to say that the training in Econometrics and Math is outstanding. The MSc. is paid, the PhD is also paid, but there are 5 scholarships or something that cover full fees plus a monthly stipend.
2 If you "leave" after the Coursework, the will support you, off course, as in everyplace, if you are good and the professors like you. There is nothing like "trying to capture students". They are well connected in Europe, but have also some good placements in US and UK (NYU, UCL). Nevertheless the stipend and scholarship start this year, so I cannot tell you how would affect your letters. What I know is that the money is provided by the FCT (some government organism in Portugal) so It would not surprise me if they (the FCT) make you sign a contract committing to complete the program, unless some disaster happens in your life (they have for the traditional scholarship exit options, but not many).
Best,