Radio Button and check box

Hi,

I am having query on Radio Button.

We upgraded from Xe to 9.1. In Xe when we are entering standard vouchers, during entering the information on GL Distribution screen, if we feel some accounts are incorrect, we delete multiple rows by selecting all the rows at a time in Xe(Highlight one row and drag the mouse for multiple rows). Whereas in 9.1 since it is radio button, we were unable to select multiple lines at a time for delete.

Can someone help me is there any workaround to select multiple lines on GL Distribution screen in 9.1.

I understand Checkbox contol is used for multiple selections and Radio button control is used for single selection. Is there any other specific reasons why we use only Radio button on certain forms instead of checkbox.