Anyone ever used cachett to add VDMX, hdmx and LTSH tables?
I wonder if people use this tool from Microsoft. If many people use it I might want to integrate it into the Font Creator Program.
News to me. I’m just trying to learn how to design my own comics-inspired non-Terran language fonts with FCP and learning the basics of that alone is interesting enough. 
Perhaps it’s useful to explain the purpose of these tables. If I’m correct they are not vitally important. A font can work properly even if none of these tables is present. Yet they are certainly useful, because they reduce the workload of the rasterizer. When a text is written to the screen the rasterizer searches for these tables and if they are found it reads and uses the values stored there. If one or more of these tables are absent, the rasterizer has to calculate these values from data stored in the font. This procedure takes some processor time and consequently slows down your computer. A serious problem can occur when a font has incorrect values in these tables, which might happen if you add a number of glyphs without deleting or updating the LTSH table.
So, Edwin, my suggestion would be to include the CACHETT functionality into FC. The more people do NOT use CACHETT the more sense it makes to include its features into FC.
Just an opinion.
I agree with Joop. If FCP were to automatically include (and also give you the option of deleting or excluding) the VDMX, hdmx, and LTSH tables, it would make FCP fonts better customizable for particular circumstances. I can think of times when the smaller file size of not including the table would be advantageous, but given the penchant of Microsoft programmers to make bulkier and more memory intensive apps, it is probably a good idea, the vast majority of the time, to save as much processing power as possible.
And his name is Erwin, not Edwin.
You’re sooo right… 
Is that tool about font hinting 
=> Yes sure please 