Feature request: click-checking choices from list of values for axis mode

[rjgoif]

The extension currently has old Automatic1111 behavior in that a populatable list is inserted as a comma-separated text string.

e.g. if you want to put Model as a checkpoint, it will fill in an exhaustive list of all your models which then you need to prune back to only the models you want.

Instead, it would be nice if there was a dropdown of all the models and you could pick the ones you want. This is how the native Automatic1111 X/Y/Z grid behaves now as of v1.6 (and the last few preceding versions as well).