When setting up new tools, when the tool is metric you input metric feed rates, when it is in imperial, you enter those types of units. We use a combination of both tools, and would prefer our feedrates to all be listed in the same format.
It would be great to have an inches/mm checkbox in the feeds/speeds tab so that you can set it up both ways.
The way we are currently working around this is to setup a tool in metric, then plug in the cutter size values. After that switch the tool to inches. Now you can go into the feeds/speeds and enter them as normal. This will show the cutter size values in the inch equivalent, which is ok, but not really ideal. Basically we'd like the option to show metric tools in metric sizes, but still be able to enter feeds/speeds in imperial.