My suggestion is not to make this a Linux only software, but to immediately work to port it to windows. A software that is working only in linux will not be adopted widely enough and most important, the auditors will not accept it as they cant see the software in their own office.
You need popularity of an accounting software, which will come only if it is working just as well as windows. As you already know, people are asking for a tally substitute on linux......as they want the same software that they use in windows.
Regards Saswata