Maybe Make it official instead of beta, and like "Find" when you open it, it takes the highlighted number.
Also, it would be useful to remember the last units you converted from and to, cause if you're working on a file with a lot of numbers, calculating the weight of something for example, it's hard to set the units every time and remember the window's position.
Like This:

@ivandrofly Maybe you could make it as a plugin?
@niksedk can you please assign me to this just so I don't forgot, would also make it easier to find in issues later on :)
Does this exist currently? How can I get to it?
@darnn There Exists a version of it...

You have to activate beta stuff for the settings file: <ShowBetaStuff>True</ShowBetaStuff>
Also, Unrelated, I found it useful to activate: <ShowProgress>True</ShowProgress> if you haven't already.
Oh, cool! What does ShowProgress do?
ShowProgress Shows you how much of the file is done.
If you have an original file opened, it shows the percentage in relation to the original.
Else, It shows the percentage in relation to the video's time.

Ah, I see. Neat!
@ivandrofly Can you work on this one? :D
@ivandrofly Can you work on this one? :D
I'll take look at this maybe in two weeks or so...
@ivandrofly What about now? hehe
ShowProgress Shows you how much of the file is done.
If you have an original file opened, it shows the percentage in relation to the original.
Else, It shows the percentage in relation to the video's time.
What result are you expecting? 馃槙
@ivandrofly I'm not expecting any other result. ^^"
He was just asking what it does.
Most helpful comment
Ah, I see. Neat!