I think this is a perfect solution and I applaud the efforts of the FTB team. Lets face it. RP2 is deeply intergrated into the FTB system. Waiting through 1.6 makes a ton of sense and I have a feeling she will update everything eventually. Good news! I am really looking forward to getting the new NEI for 1.4.7 The 1.5.x pack i am also looking forward to because powersuits mod has made some changes and of course rednet cables are interesting.
You do realize that even if she updates for 1.5, he same situation would occur for the 1.6 release anyway right? That is part of the issue with it. There are no guarantees.