Relatively down on its uppers these days, Lotus Development Corp has decided to pay more attention to Unix, forming a Worldwide Unix Group bringing together existing marketing and development efforts into a team as part of the Lotus International Business Group. Long-time Unix maven Larry Crume, vice-president of international product development, will ramrod on a day-to-day basis. Lotus intends upgrading its Unix 1-2-3 products, moving to additional systems like the RS/6000 and creating Unix versions of Notes and cc:Mail. The Lotus Realtime Products Division, headed by Brian Bell, will be part of the new unit. Marketing and business development, meanwhile, will be run by David Rome.