anything you want is an option, even if it doesn't show up as an option.
I spent 5-6 years looking for a remote control that wasn't junk..
You can always buy a cheap motorized ALPS volume control on ebay for $40 if you're cheap and lazy,
but you'll turn a great preamp into a so-so preamp.
I've found 3 remotes actually worth buying, two are over $400, the last is the Khozmo 64 step attenuator which is a volume only remote,
no source selection with remote, and it's a bargain at $280, but not practical as a retro-fit unless you want to pay another $120 for a new front panel if you want the volume displayed. If you don't need the display, it can fit where the original volume control was,
and you'll just need one extra small hole for the sensor.
Another good option is from BentAudio, they have a couple of different remotes,
one is a stepper for a Goldpoint attenuator, another will also do source selection.