Vlada - The January release is scheduled to contain Forms2.0, unless there are major problems during beta.
IF the release goes as scheduled, you'll be able to easily add a dependency which says, if they select OTHER from the set of options, display a 2nd field where they can put in their response. In this case you'll still need to create a field, Issue Tracking Other.
I have 10 "Generic Fields" where random data can be temporarily stored. Like whether someone wants an appointment at an upcoming trade show. However if you want to be able to reflect on the issues tracked, I'd suggest creating a custom field.