Description:
1. Libreoffice for Mac should support "ctrl+key" as shortcuts. This would extend the range of possible shortcuts.
2. "alt+key" should be avoided (for Mac): alt+key are characters like € and should not be used as shortcuts (use ctrl instead (see above))
2. There should be "prefix" keys like "ctrl+p". Then "ctrl+p,0" could be used for the "standard paragraph", "ctrl+p,1" for a paragraph with intend etc. (this is supported e.g., in MacWord

Actual Results:  
Examples:
cmd+c, cmd+v are system shortcuts, should not be redefined by LO
alt+e=€ is an extended character, should not be used as shortcut


Expected Results:
works as described


Reproducible: Always


User Profile Reset: No



Additional Info:
alt+key should be avoided (because overloading of character set)
ctrl+key should be used instead
prefix-key should be supported (like ctrl+p)
OR: alternative: sequences of two keys should be supported (like ctrl+p,x) for paragraphs, ctrl+f,y for fonts etc.


User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:59.0) Gecko/20100101 Firefox/59.0