We also have been using XLFR5 as a fast vortex lattice analysis method to compute the induced drag from a simple flat plate model. We considered supporting this, but instead of just supporting this single solution - Rob has done something much better that you'll see in V3.0. I encourage you to consider coming to the OpenVSP workshop in August to hear and understand the new degenerate geometry capability, where your VSP model can be the basis for a number of different types of degnerate geometry models (from sticks to flat plates to paneled surface..). In addition, we've taken an even better step that merely creating a XLFR5 degenerate model. We wanted a fast vortex lattice method that could be distributed directly with OpenVSP. XLFR5 uses XFOIL and AVL which we wouldn't have the right to distribute. So there is a new VSPAERO vortex lattice method (which has already been finished but hasn't been ported to Windows or fully integrated into the latest OpenVSP yet). This method will be completely open source and distributed with OpenVSP (so no more need to ask for Vorlax or bother trying to use the old Vorview - which had many issues). Even cooler, VSPAERO has actuator discs already integrated - so you can perform fast/easy aero-propulsive analysis. This was written by Dave Kinney at Ames; we've been beta testing on some Distributed Electric Propulsion concepts recently, and the results are highly similar to StarCCM results (which we run by directly exporting stl files from OpenVSP). All this is frantically being integrated by Rob et al, and we're very excited about the incredible progress they've made over this past year. The V3.0 release is going to be pretty incredible, and there is going to be so much new material to go over at this year's workshop. I hope you can be there to fully immerse yourself in these new capabilities. I hope I haven't over promised and the all of this will be ready by August...
Mark