My friends run a B&B. Let's say the cost of a room is 200 for 1 person. but for 2 it's 240 (not 400). I could do it by custom fields but it's loads of work and making the calculator bit more complicated it could do the trick..
Also maybe an option:
there are 5 rooms and I don't care which I get as long as it's free at the time I need it. Maybe there would be a possibility to make a reservation calendar for all rooms, so I just choose the time and than I get the feedback if there is any room left? (just like here: http://www.arrivia.eu/book.html)
the plugin is great - thanks!