Thanks for your reply!
To answer your question, yes i think Ex should block the attempt if it's going to overwrite footage. I think as far as usage case goes it's more likely that someone would want to move a clip in between two clips and if it overwrites they probably didn't give it enough space to fit. At least that's would usually be the case for me.
An option to overwrite or not would work. An option to overwrite or insert would be great also.
For the record I actually solved this issue with a macro. I used, Ctrl-c, del, Ctrl-p. Works great!
P.S. Loving the Extension. Favorite thing so far, Duplicate and Increment sequences. I can't help but to smile every time I do it. Plus it solves the classic mistake of duping your cut renaming it then continuing to work on the old cut.
Thanks dude!!