unfortunately shift is used to walk in cs, and remapping is sort of a bad idea anyway. i mean i used to remap keys all the time, but once you've gotten used to something its a bad idea to mess with it. Plus there really is no way to remap those keys, since control and shift are both used idk where i could remap them to.
So i guess something about the control key just messes with keyboards? My dell was able to handle it fine.
No, but the control key is apparently often on the same column as the W, so introducing another key on a row connected to either will cause only the first two keys you press down to register. It's nothing to do with control specifically, if you replace it with S you'll get the same behavior.
That's the electrical rows and columns, there's no guarantee they'll correspond to the rows and columns on the keyboards (and generally don't).
What you need is a keyboard where the key combinations you want don't interfere - unfortunately even the best keyboard manufacturers don't publish this information. You could try asking the manufacturer about any particular keyboard you're interested in, but I don't know how helpful they'd be (it's not a trade secret or anything, you can easily tell by eye if you take the keyboard apart).
Apart from that your options seem to be:
Buy a keyboard you know is good from experience (i.e. another keyboard the same model as your old dell). I don't think there's any reason a PS/2 converter would affect this.
Find someone else with a keyboard you're interested in and ask them to test the combinations you want.
Buy a keyboard that's marketed as having at least one key for every three key combo you'd use anti-blocking. (and at least two keys in a four key combo).
Find a forum and make a thread there asking people if their keyboard handles ctrl+w+r. This is just about the worst forum for that since most people here have expensive or out of production keyboards. You might get a couple of results here though - I know the Cymotion Expert is fairly highly thought of and the sort of price you're looking at.
