If you're trading @9.95 plus ECN fees, and even if you're going the cheap route (ISLD), a 5000 share trade would be:
9.95 + (.005 * 5000) = 34.95
with TS new commissions (.012/share up to 1500, .0075/share thereafter) that would be
(1500 * .012) + (3500 * .0075) = 44.25
BUT if you use more than one trade either to enter or to close the position, the advantage evaporates (due to the extra ticket charge), and quickly turns into its opposite.
If you're trading per share, then you can scale in or out lot by lot, if you choose, without even thinking twice.
If you use a more expensive ECN or other route, then even the initial advantage may disappear, or turn into a disadvantage.
And if you trade in much smaller quantities, then there's really no discussion, of course.
If you're still committed to ticket charges or some other alternative arrangement, and want to use TS, you might very well be able to work something out on an individual/special basis. Like most brokers, they'll try, for obvious reasons, to work out deals with relatively "big" clients.