There should be some option where the bills can be sperated unequally say in the form of share or percentage or some other means

thanks for your feedback.
you mean splitting one item on an itemized bill unequally between people, right?

we have thought of splitting it by share.. by default all participants have one share, so for example an item with two people: it is split 50%:50%, if you add an additional share to one person it would split 33.3%:66.6% (1:2) like if you have 3 beers split for two people, but one friend should only pay one.. is this what you mean?

regards,
Herbert