The biggest problem with the Redgate SQL Toolbelt is just how heavy it is; it seems to take a lot of resources. It takes a lot of memory and a lot of processing power to run, and that tends to slow things down a bit. Making it a little more lightweight while still doing the same thing, as much as possible, is what we would like to see in the future. I've noticed that Microsoft SSMS runs much quicker without RedGate installed than it does with it installed. From bootup of the app to opening query windows and connections, SSMS is quicker without Redgate than with, by a significant margin. The other area for improvement is regarding licensing. Every month or two my SSMS loses it's redgate license key and I need to re-enter the key to continue using Red Gate, even though the license is annual.
