Exporting to CSV is on the roadmap. the plan is to save the exported file in MyDocs folder. do you have any other suggestions?
it will take some days though. currently busy with multiple works.

finished coding & testing of recalling last used currency rate other than '1.0'. I thought this might be better, as there is no memory/effort involved in typing '1.0'. For each trip you can have different last used currency rate.
I'm planning to release it along with export feature. If you need it urgently i can upload a deb.