additional positioning flexibility and grace note flexibility

I am trying to create a senza misura passage, but many of the default layout positions that work so well with metered music are impeding my attempts to space the notes and slurs as I want them to be.

1. Throughout this first line, I want to be able to group these beamed grace notes under a slur. I can make the slur with flexibility if I use S on my QWERTY keyboard, but it's not reposition-able if I click it from the lines menu.

2. I can't use my MIDI controller to change the pitch of grace notes. I have to use my directional keys on my QWERTY keyboard.

3. I want to be able to make plain open noteheads even when they don't fit into the meter. This option isn't available in the noteheads palette.

4. I want to be able to reposition individual notes. I can move the element (the notehead), but the stems and accidentals don't follow along on my diads. The automatic spacing keeps adjusting things after I put them in place, too.

5. I want to compose a piece where accidentals don't carry through the measure. I have the courtesy accidental plugin, but it doesn't work on every note. For example, m. 2 in the last grace note grouping the courtesy accidental plug in doesn't create a sharp in front of the D or the C.

If there was a Senza Misura mode, this type of unmetered gestural music would be easier to create. If there was a toggle to be able to change accidentals carrying through the measure, this music would be easier to make, too.