1) Bible tabs sorted by Version abbreviation rather than file name.
2) Dictionary and Commentary tabs "link" state remembered between invocation of the program. If I have the Dictionary tab "un-linked" and close the program, when it restarts, it is again linked.
3) Scripture links tooltipped and click-able in the BIBLE tab. Example, in the AMP Bible, there are links to other scripture references. Make these "live" tooltips and click-able. Make this available for any Bible that has them in their text. (see Mat_1:1 AMP)
Just thinking out loud...