1) We use a bug tracker internally – send your issues to sup...@openrules.com.
2) You may use Dates without time in all decision table cells with standard comparison operators – see http://openrules.com/pdf/OpenRulesUserManual.pdf pp. 17, 55, 70. You may add a column to compare hours as regular integers or doubles. You also may extend the standard decision templates by adding a column to compare time. Let us know if you need help.
3) You may put condition/action expression in a table of the type “Method” and then call this method from different decision tables