3. about the monthly cost what the behavior i saw was, it works well when lets say i added a monthly cost today and it works for next month. But when i add a monthly cost with an old date (lets say an year old) it doesn't repeat.  

here is the screenshot for date format.

yeah, your opinion is correct. adding it as an option will be good. Looking forward to it.

acar has such push down mileage feature. it would be great if you can add it