Not just charms, if you've got gear that does str too then you can put it on in a certain order to obtain the next str req and so on. For example w/ my zon first I put on Nosferatus Coil(+15 str). Then I put on my Gskull and since the Gskull gives(+25 str) I can take off the Coil(-15 str) and still have enough str for most of my gear, but then I need to put on Mavs gloves/belt(+20 str) so I can use my Upd Shaft.
Same w/ my Hammerdin I put on a str ring to use my Upd Hoz, but then since the Hoz does +20 str I don't need the ring until I die. Or in my zons care leave a game.
The biggest thing you have to watch out for tho is when you die and end up having two boddies both w/ gear on them DONT LEAVE the game. You will lose gear. Popping doesn't neccarilly happen anymore but this is just as bad.