Some of our clients use multi-select dropdowns very much. A common solution to store many selected items is by assigning numbers to the values, and setting the 'real, textual values' in the description. This way we can store many more items without having to create a field with a ridiculous long length.
Only one problem: the Act! search function only search in the values, and people don't remember numbers very well. The question is: can you guys make the search option to also search in the descriptions? That would be really helpful to a lot of customers!