ghetto
What your trying to do is not realy editing as we editors know it !
If Casablanca does what you need then use that, the quality will be ‘good enough’ for what your trying todo i suspect.
That said in FCP select the roll tool (looks like an 8 ) click on the edit type in -30 (this trims the edit 30 frames back) right click on mouse which gives a mini menu and select add dissolve job done.
I reckon it would take you less than 5 seconds to do each edit.