Since putting launchers and snipers in backpacks was disabled playing a sniper that needs to adapt to different situations has become difficult, the sniper is forced to drop his sniper on the ground when using is backup weapon. I know players who like to have a large calibre sniper with a small rifle or SMG as backup.

It seems there are two options to solve this.
1: Allow all weapons into the launcher slot.
2: Special weapon backpacks that all guns fit into but have a small capacity for other items.