Command vs. Alt vs. Win - trouble running non-GS applications

[mbert]

I am using an old thinkpad carbon for running NEXTSpace which I am currently still evaluating.
It looks I my Alt key is mapped to Command. So far so good. However it does not look like I can map Alt to any other phyiscal key.
I use tabbed terminal emulators (like tilda) which are all configured to use the "same" shortcuts I use on my Mac (hence: Alt-t for new tab, Alt-{} for navigating between tabs etc.). I can't get any of this to work. They don't know what "Command" is, hence I cannot map anything to "Command". I have played around a bit with the modifier key preference, but that was to no avail either.

I guess that a way to freely map Alt and Command to any physical keys, so that one could use Alt and Command alongside each other.

[trunkmaster]

@mbert you're right at current state of window manager implementation Alt (or Command) is mapped to app menu actions. App menu for non-GNUstep applications created by Workspace. I'm close to the where it would be better to drop this idea and move such menu to titlebar right-click menu. I'll look at this later.