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Modplug tracker has this option, where if you paste data that would go past the end of the pattern, it overflows into the next pattern. This is really great for building echos.
2. Option to keep selection when switching patterns.
Many old-school trackers keep the selection after switching patterns. This is really helpful when you want to copy and paste a section of your piece that is many frames in length. In FamiTracker you have to re-select the data again at each pattern. Being able to leave the selection there is also very helpful when trying to relocate data from one channel to another, since you no longer would have to go back to that channel to set up the selection then return to the channel you're pasting to at each frame.
3. 3xx and note retrigger.
This has an inconsistent behaviour. For VRC7, notes are not retriggered if a 3xx effect is used. For everything else, they are.
Because a portamento without retrigger is actually quite useful (probably more useful than the existing portamento with retrigger), I would recommend creating a new effect that bends the pitch without retrigger. Maybe Lxx? This way old documents could be converted easily, i.e. 3xx becomes Lxx if on a VRC7 channel.
4. Keyboard commands for order functions.
Move frame up, and move frame down would really benefit from keyboard commands. (Currently if you want to move a frame far, it's better just to recreate it and then delete the original.)
Insert frame is just barely accessible by keyboard by pressing Alt, M, I in sequence. Unfortunately the move commands are not accessible this way. It would be better if insert frame was assignable to the keyboard as well, rather than a sequence of keystrokes through the menu. The menus also lack the letter highlight underline that would normally identify which ones you can keypress to use.
I'll add these to the todo-list. If you wanna add anything then that's ok too.
4) Some key shortcuts are available when enabling edit mode for the frame editor, accessible from the F3 key. Then you can use Ctrl+Up/Down to move a frame up or down and insert/delete to add or remove frames.