Attaching 5 strands into 1 end terminal can be done with the proper sized & type of end fastener and pliers, but personally with heavy glass beads I would not choose the single crimp route. First off the end beads would have too much tension and chaff against each other causing chipping if strung to the crimp unless you are using seed beads or micro spacers for the last half inch or so. With more than 2 wire pieces feeding though any single crimp opening to form a loop the finished crimp will be mis-shapen even when using the best crimp pliers for the crimp size. Also tigertail tends to be thicker than other coated wires that support the same weight and only the bigger crimp beads would work which may not fit any of the crimping pliers commonly available through retailers.
Personally if I was making a design with 5 strands onto a single loop clasp there are 3 ways I would go about it depending on the final look I was going for.
1. String each strand with it's own crimp bead around a single medium to large jumpring closing the crimps with with the proper crimp pliers for the crimp size used. Cover all 5 crimps with a single large crimp cover and close. Attach the jumpring into the clasp terminals.
2. String each strand leaving some beading wire exposed, about 1/3 to 1/2 the length of a terminal cover, with it's own crimp bead around a single eyepin closing the crimps with with the proper size crimp pliers for the crimp size used. Pull all 5 strands on the eyepin through an end cup or cone. Attach the clasp terminals by making a simple or wrapped loop out of the rest of the eyepin.
3. Use a multistand crimp end like
http://www.firemountaingems.com/details.asp?PN=H201292FY . Close using bent nose pliers in the center of each "dumb bell" segment. Attach to clasp using a jumpring.
Store owners (or store clerks) are not always knowledgeable on all of the specifics of all of the products they carry. When you're ready to learn a new method or technique it's best to take a class with a certified instructor, check your local bead and craft stores as well as community colleges and local recreation departments for beading or jewelry classes that fit your budget. If money is tight, go to the library or spend a free day searching the WWW for instructions that include detailed illustrations on what your trying to do with photos of the tools and supplies needed to achieve the look.