Bioshock "Reserved Key" Binding Bug

Grumble.

I've been playing through Bioshock again, but on the PC this time, and I've run into a rather annoying bug. I'm at the point where I can choose to (well, it's a really minor spoiler, if you've heard absolutely nothing about Bioshock) harvest or rescue a Little Sister. Problem is, it just says Harvest ((Unbound)) and Rescue ((Unbound)) next to her.

Trying to bind anything to either of these fields using the Customize Controls menus gives me a message saying that "So-and-so key is reserved. Please choose another key." Problem is that every single key on the keyboard and mouse is apparently "reserved". Oddly enough, though, I can bind keys to certain other fields.

Anyone know how I can work around this? I've tried editing my user.ini and defuser.ini files, but can't figure out what the bind commands for Harvest and Rescue are.

Can't advance any further til I manage to work around this This was supposed to be fixed in the patches already >_<

 

[posted here as it's the first Google result]

I've got this too, but there is a fix:
You need to add the commands to DefUser.ini and DefUser_< language >.ini (usually 'int') files. This must be done in the section headed Gatherer Choice, it won't work anywhere else.

The commands are SaveGathererExec and HarvestGathererExec and should be bound to bound to a key by simply adding them to the lines for those keys.

I've added mine like so:
The section
Left=
Up=
Right=
Down=

Became
Left=
Up=SaveGathererExec
Right=
Down=HarvestGathererExec

Hope that helps.

 

I've had the odd case where the hack and use functions for a machine also say unbound, but pressing V and E still work fine. Try pressing H for harvest and L to rescue.