Currently, you can either lead or ride a mount. If you fall off, you need to
start leading mount. If you want to mount, you need to stop leading mount.
This leads to the situation where one must handle these transitions by
triggers.

If it were possible to lead and ride a mount, you could make sure that the
mount follows you, regardless of your riding status. Yes it would be an
upgrade, since it would remove the need to create triggers and have something
available ingame, sort of in the spirit of repeat command, which seems like
its there for useability so everything doesn't need to be done by trigs.

++glaurung