I have a ton of CAT5e RJ45 connectors I would like to crimp onto CAT6 cable - TECHNICALLY they are not CAT6 but do not see much of a difference. I have done a few already with no prbs but have many more to do and don't want to have to redo them. My CAT6 is SOLID and the connectors are for solid and not stranded.
I wouldn't use a screwdriver. That may cause more harm than good. Make sure you have a good quality crimper and that you are using cat6 RJ45 plugs. I have seen many people use cat5 and cat5e plugs which can make it easy to mess up when crimping the plug onto the cable. Once you know you have a good plug installed (you can see copper tips from the front view), test again. If it throws an error, you may have a bad wire deeper in the cable. Depending on the tester you have, it might tell you how far down the break is.
The connectors will not be rated for higher speeds but to be honest the difference is unlikely to be significant over such a short distance. The biggest problem you are likely to face is mechanical when fitting the connectors in the first place - category 6 cable is quite a bit thicker than category 5e.
No. The same connector will work.
Gack ! don't understand the reason for doing such a thing since CAT 6 costs more then CAT 5. But your idea should work. Personally I would use CAt 5 with CAT 5 and CAT 6 with CAT 6
RJ45 is RJ45. The cable is different, the connectors are the same. (Some places sell CAT6 connectors for a premium. Some people also sell Roleks watches. The unwary buy both of them.)