I don't know if I am reading this correctly, but why is ReadyBoost only using 4GB when I have dedicated 32GB?
A firewall that keeps a record of the state of a connection between an internal computer and an external device is using what technology? Stateful packet filtering RFID is commonly used to transmit information between networked computers.
Readyboost should have no problem allowing 32GB of space on Windows 7, so long as you have formatted the drive using NTFS or exFAT. If you have formatted it as FAT32, though, you'll be limited to 4 GB.
Note that you are unlikely to see significant performance gains on modern hardware, mind you. You'd be better off going for an SSD. Still, Readyboost may provide a small benefit to you, particularly if your existing mechanical drive is old and slow.