I'm not sure I understand your example. You can certainly enter something like 1.2 as the multiplicand, to change 22 to 26.4. I assume this is the SNMP data source?

The answer is likely no, there is not a general purpose tool other than Meta Points or connecting a Point Link or Script to a virtual point for arbitrary transformations of a value. Meta points are incredibly flexible, and if you're running on Java 8 their overhead is very small (still pretty small on Java 7, only somewhat problematic on stressed single core machines), especially if they're doing simple multiplication / math.