At the end of the day, no matter what label you slap onto them, they will still be considered by the IRS to be LTPTs. Since they are only allowed to defer, so let them! They will not be getting employer match or nonelective contributions. Make eligibility for deferrals date of hire and be done with wrangling over whether they met the hours requirement. But keep the age 21 and 1,000 hours requirement for employer contributions. If you think about it this way, you avoid a lot of gnashing of teeth and splitting of hairs over this issue.