Well you are missing the key fob style remotes, but the WAF goes way down when you hot glue them to the wall.
No you are not missing anything if you confine yourself to X10.com. A decade ago X10 offered a two switch RF remote, but those were replaced by the three switch "Stick-A-Switch". From a price stand point X10.com has your best offering. If you don't mind paying bigger bucks, go to
www.Smarthome. com and look at their X10 compatible Leviton controller
http://www.smarthome.com/4201wr.html which at one time offered both one and two button wire in transmitters. This sytle requires a neutral wire in the switch wall box, which your 100 year old house may not have. Also look at "keypadlinc" while at Smarthome.
Probably the simple answer to your question is "No, you are not missing anything".