I know this is kinda unrelated, but it being called "FX-mixer" has always bothered me. It doesn't mix FX, it adds FX to mixer channels. Me and my technicalities...
If LMMS is taking ten minutes to start, I'm thinking that your computer is not very powerful. Go to your control panel > System and Security > System. Look for the area under "System" and tell us what it says. If you'd rather take a screenshot, that works too. I'm looking for your processo...
I still provided an answer: it isn't possible to make the song editor and B&B toolbars different, as they use the same resource. There are three bars that can be styled individually: The Main toolbar, the Secondary toolbar, and the Sidebar.
Hiya! I did Teal 2. So if I'm understanding you right, you want both bars to be the same? The two horizontal toolbars are set by .png images in the theme directory. Look for "main_toolbar_bg.png" and "toolbar_bg.png". The vertical sidebar is styled in the style.css file: QToolBar...
While there is a risk of shifting semitones, I think most people with an ear for pitch (or knowledge in music theory) will be able to tell if they were sloppy with their dragging
Hit Ctrl+a or hold Ctrl to select the notes you'd like to more, then drag them over the amount you would like. Unfortunately there is no way to insert/delete space in the piano roll, but in the Song Editor you can hold Shift+Insert/Shift+Delete to add or remove measures from where the playhead is.