Hi Mike, yeah right now the main way to do the circular array by 2 points would be to set your construction plane (View > Cplane) to have its z axis running along the axis you want to use. Then when you're done it's easier to reset the cplane (right click on View > Cplane) than it is to relocate objects around.

It could still be a possible feature to add in an axis to the circular array command, but do you need some tips for working with the construction plane right now? Would you like to start up a new topic with an example file that has an axis line in it and an object you want to array so I could show you some steps for setting up the cplane?

But basically if you draw in a line where you want the array axis to go, if you then place the cplane onto the start point of the line, it will automatically orient its z axis to point along the line's direction (unless you turned off "Align to objects") so you don't have to do any other fancy repositioning after the initial placement, you would just right-click to accept the default orientation and then your drawing plane will be set to the plane you need. Then when you're done with the array right click on View > Cplane to reset it back to the default world axes.

- Michael