NOTE: this does not completely remove sandbag. It only removes the sandbag that spawns at the beginning of a fight. You can still get the sandbag item when you turn the item on.
For some reason replacing the MiscData0 in the stage pac didn't make the sandbag disappear, but Libertyernie found a way to get rid of it with .rel files. That means no more gimmicky stuff! Its not really hard to get rid of it.
1. Grab this .rel file
http://www.mediafire.com/?gkeikwjjqz1 (these are rels that are modified to have no sandbag) and save it where you can easily find it.
2. Get a hex editor. It really doesn't matter which one you use. If you don't have one, google is your best friend.
3. Use your hex editor to open your .rel file. You should get a lot of hex values. Use the search function to find this hex value
38 A5 00 00 38 80 00
That part should now be highlighted. The 2 values behind it are what we are going to edit. Right now the values should be 00. Replace it with the value of the stage you want to replace. The values can be found here
http://ssbbcustom.wikia.com/wiki/Module_filesFor example, if you want to replace the Wifi waiting room you have to change the 00 to 37.
4. Save your changes to the rel file. Now go to where you saved your rel. We are now going to rename it. Go back to
http://ssbbcustom.wikia.com/wiki/Module_files Now look for the stage you want to replace. Behind the values are the names for the rels. Go back to your .rel and rename it accordingly to the stage you're replacing. Example: if you replace wifi waiting room the rel must be named st_otrain.rel
5. Now put the .rel in SD\private\wii\app\rsbe\pf\module and try it in-game. If you did everything right, there should be no more sandbag! (except if you turned the sandbag item on)
I'm not exactly sure if this works with stages that already have rels included but in theory it should work (replace the old rel with the modified one)
Hope this was helpful!