Lance,, You crack me up.. You assume since someone contacts a mfg with a suggestion they are going to jump through hoops and do it..
Having the privilege, (Or duty) of working in Mfg, and occasionally having the privilege of dealing with customer suggestion, I can assure you, that even though the suggestion makes sense, they are not always as simple as pushing a button and doing it..(If it was simple, everyone else would be doing it already, right??)
Many times very simple sounding suggestion can be very cost intensive causing major tooling change overs and expense.. Even then if the mfg, makes the decisions to do it, it can take months to even a year or two to bring it to fruition.
For starters, I think carbon arrows are wound "Over" mandrels,, to add an internal foot, you would have to undercut the mandrels.. Then you have the problem of winding the extra fiber in a unique pattern.. Now does it affect your ability to remove the shaft from the mandrel? How many mandrels do you have? I am guessing they have several..(like maybe hundreds) Now what do you do with the old inventory already in the system?? And it goes on and on.. Have patience my friend,, If it's doable, and creates a market, it will happen.. In the mean time, keep putting them flimsy beer cans on hitting what your looking at, and all will be well.