I'm just trying to justify the pad itself. Can anyone give me multiple applications to having a number pad especially one that isn't attached to the board? Like what things can I do to make use of the pad more?
The biggest use of a separate numberpad is so you can have a 60% board, then your mouse, then the numberpad on the other side of the mouse so you can go from typing to mouse and back quicker. If you're coming from a fullsize board the strange stagger on the alpha keys is hard to adapt to when you put the numberpad on a layer - the standard matrix layout is already in muscle memory.
If you turn off number lock you can use 2,4,6 and 8 as arrows and 7/1 as home/end and 9/3 as page up/down, replacing the nav keys. This pad also has =, escape, backspace and tab keys which are really useful if you're using spreadsheets (unhelpfully this pad moves - as well as shrinking + though) and there are sublegends for cut/copy/paste rather than having to reach for ctrl+x etc. Oh and a 00 key, very handy if you remember to use it and aren't used to hitting there for 0
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If you can't think of a reason to use a numberpad you probably don't need one, but I guess you could take the Jack and sell the pad to someone who does...