If you want to make Limit skills always available, you can create a new materia in Wall Market. In Materia Type, select "12: Command materia, replace attack with command at offset [1] to [5]", and type 20 in the first box below.
After that, all you need to do is put this materia into your character's starting equipment / make it available in shops with WhiteChoco / edit you save-file with BlackChoco, and you're done. Now you can spam limit abilities as you please.